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Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面

Flask框架的学习笔记

- 写在前面
- 配置环境
- 创建项目文件
- Hello Flask
- 请求方式GET与POST
- 返回一个网页
- 发送数据到前台
- 获取前台数据
- 上传文件到后端
- 实战：实现一个简单的登录页面

写在前面

Flask是一个使用 Python 编写的轻量级 Web 应用框架。Flask对比Django框架灵活度更高了，可以自己一些设计代码框架，可以说他是短小精悍。

学习flask框架的目的是给自己的网页做一个后台系统、搭建属于自己的api系统，这也是我学习这款框架的原因。

下面我们开始正题

配置环境

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple Flask

创建项目文件

这里我是用的开发软件是Visual Studio Code
首先在在存放项目的位置新建这样几个文件

目录结构为

pyflask
--app
----templates
------index.html
----__init__.py
----routes.py
--run.py

然后右击项目文件夹pyflask使用vscode打开

这里我就犯过这种错误，如果不以文件夹的方式打开项目最终程序会因为找不到路径报错

Hello Flask

然后我们分别给每个文件填上以下代码

init.py

# 这里注意导包的顺序不能错乱
from flask import Flask
# 创建app应用,__name__是python预定义变量，被设置为使用本模块.
app = Flask(__name__)
from app import routes

routes.py

# 从app模块中即从__init__.py中导入创建的app应用
from app import app


@app.route('/')
def getIndex():
    return 'Hello Flask!'

run.py ：这里我们需要了解的地方是app.run（）这个函数
debug参数开启后文件发生改变及时重启服务器
关闭后需要手动重启服务器内容才会发生改变
host为ip地址默认为以下参数，然后我们通过127.0.0.1即可访问
port参数为访问端口

# 从app模块中导入app应用
from app import app

# 防止被引用后执行，只有在当前模块中才可以使用
if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=3000)

index.html(这里我们还用不到，但是后面的返回网页需要使用)

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="utf-8">
        <title>这个是我的标题</title>
    </head>
<body>
   这里是我的网页内容
</body>
</html>

然后我们运行run.py出现以下信息表明运行成功这个使用我们访问
win：http://127.0.0.1:3000/ 或者 http://localhost:3000/
linux：http://localhost:3000/
然后我们就会看到以下结果恭喜你已经完整搭建好了flask框架！

通过代码我们可以看到我们前台的数据和routes.py文件中的函数返回的内容相同，是的我们的内容确实是来源于routes.py也就是路由，读者可以自行尝试更改return的内容来测试前台数据的变化。

下面我们使用flask框架返回一个网页试试

请求方式GET与POST

在信息输出创口我们可以看到我们通过浏览器访问数据是使用的get请求，如果我们要实现post访问的测试我们需要用到一个软件
apipost
然后我们使用get请求再试一下前面的测试
返回没有问题，然后我们使用post请求测试以下
我们可以看到网页返回了一个405错误
然后我们这里引入新的知识，访问方式在routes.py中修改内容为

# 从app模块中即从__init__.py中导入创建的app应用
from app import app

@app.route("/", methods=["GET", "POST"])
def getIndex():
    return 'Hello Flask!'

这里我们给app.route()中添加了一个methods参数这个参数表示该路由接口可以使用GET和POST两种方式请求，下面我们实现一个post和get请求分别返回不同内容的例子
在routes.py中修改

from app import app
from flask import request       # 判断get还是post请求

@app.route("/", methods=("GET", "POST"))
def getIndex():
    if request.method == "POST":
        return "post flask"
    else:
        return 'Hello Flask!'

然后我们再使用工具测试一下

下面我们开始实现返回一个网页试试

返回一个网页

这里我们就要用到前面创建的templates文件夹了（其实主要还是要用文件夹下面的html文件）
然后我们在routes文件中新建一个路由，并引用返回html的模块，具体内容如下：

from app import app
from flask import request       # 判断get还是post请求
from flask import render_template  # 读取template中的网页文件


@app.route("/", methods=("GET", "POST"))
def getIndex():
    if request.method == "POST":
        return "post flask"
    else:
        return 'Hello Flask!'


@app.route("/index")
def getHtml():
    return render_template('index.html')

然后我们通过浏览器访问可以得到以下内容

发送数据到前台

然后我们来实现通过后台修改前台数据内容，这里展示两种方式实现：
方式一：

routes.py

@app.route("/index/"</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">getHtml</span><span class="token punctuation">(</span>title<span class="token punctuation">)</span><span class="token punctuation">:</span>
    <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">'index.html'</span><span class="token punctuation">,</span> title<span class="token operator">=</span>title<span class="token punctuation">)</span>
</code></pre> 
  <p>index.html</p> 
  <pre><code class="prism language-html"><span class="token doctype"><!DOCTYPE html></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>{
    {title}}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
   这里是我的网页内容
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre> 
  <p>效果<br> <a href="http://img.e-com-net.com/image/info8/f64424ea65f647f8897f7829f8be4aef.png" target="_blank"><img src="http://img.e-com-net.com/image/info8/f64424ea65f647f8897f7829f8be4aef.png" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第10张图片" width="609" height="180" style="border:1px solid black;"></a></p> 
  <p>方式二：</p> 
  <pre><code class="prism language-python">@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/test"</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">getTest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    title <span class="token operator">=</span> <span class="token string">"情人节快乐"</span>
    <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">'index.html'</span><span class="token punctuation">,</span> title<span class="token operator">=</span>title<span class="token punctuation">)</span>
</code></pre> 
  <p>沿用方式一的index页面内容即可<br> <a href="http://img.e-com-net.com/image/info8/3e502b3e4cbe4e8a90a88b93eedb4999.png" target="_blank"><img src="http://img.e-com-net.com/image/info8/3e502b3e4cbe4e8a90a88b93eedb4999.png" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第11张图片" width="482" height="152" style="border:1px solid black;"></a><br> 再index文件中其实我们也可以使用判断语句以及for语句，具体使用方法如下</p> 
  <pre><code class="prism language-html">{% if text %}
  <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>传入得内容为{
    { text}}!<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
{% else %}
  <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>未传入内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
{% endif %}
</code></pre> 
  <p>在html中使用{ { 变量 }}来接受后台传入的数据<br> 使用{% 语句 %}来循环和判断语句<br> <a href="http://img.e-com-net.com/image/info8/5b18bcbec2954a0eb09d41f52aad4710.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/5b18bcbec2954a0eb09d41f52aad4710.jpg" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第12张图片" width="650" height="144" style="border:1px solid black;"></a>这里我的代码为<br> routes.py</p> 
  <pre><code class="prism language-python"><span class="token keyword">from</span> app <span class="token keyword">import</span> app
<span class="token keyword">from</span> flask <span class="token keyword">import</span> request       <span class="token comment"># 判断get还是post请求</span>
<span class="token keyword">from</span> flask <span class="token keyword">import</span> render_template  <span class="token comment"># 读取template中的网页文件</span>


@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/"</span><span class="token punctuation">,</span> methods<span class="token operator">=</span><span class="token punctuation">(</span><span class="token string">"GET"</span><span class="token punctuation">,</span> <span class="token string">"POST"</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">getIndex</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    <span class="token keyword">if</span> request<span class="token punctuation">.</span>method <span class="token operator">==</span> <span class="token string">"POST"</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> <span class="token string">"post flask"</span>
    <span class="token keyword">else</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> <span class="token string">'Hello Flask!'</span>


@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/index/<title>"</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">getHtml</span><span class="token punctuation">(</span>title<span class="token punctuation">)</span><span class="token punctuation">:</span>
    <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">'index.html'</span><span class="token punctuation">,</span> title<span class="token operator">=</span>title<span class="token punctuation">)</span>

    
@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/test/"</span><span class="token punctuation">)</span>
@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/test/<text>"</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">getTest</span><span class="token punctuation">(</span>text<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    title <span class="token operator">=</span> <span class="token string">"情人节快乐"</span>
    <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">'index.html'</span><span class="token punctuation">,</span> title<span class="token operator">=</span>title<span class="token punctuation">,</span> text<span class="token operator">=</span>text<span class="token punctuation">)</span>

</code></pre> 
  <p>index.html</p> 
  <pre><code class="prism language-html"><span class="token doctype"><!DOCTYPE html></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>{
    {title}}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
    {% if text %}
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>传入得内容为{
    { text }}!<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
    {% else %}
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>未传入内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
    {% endif %}

<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre> 
  <h2>获取前台数据</h2> 
  <p>这里我们就会用到post请求方式，get又称为显示请求，post称为隐示请求，如果我们写一个网站把账号密码显示到浏览地址是不是总觉得不安全吧，所以我们这里需要使用到post请求，但是post请求也不是绝对安全，但是我们在数据传输得过程中肯定是要使用post请求得，这样必get肯定安全不少，下面看示例：<br> 这里我们在templates文件夹下面添加一个login.html文件内容如下：</p> 
  <pre><code class="prism language-html"><span class="token doctype"><!DOCTYPE html></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>登录页面<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span> <span class="token attr-name">align</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>center<span class="token punctuation">"</span></span> <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        username:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>br</span><span class="token punctuation">></span></span>
        password:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>br</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>登录<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>br</span><span class="token punctuation">></span></span>
        {
    { msg }}
    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre> 
  <p>然后再路由文件夹下面添加</p> 
  <pre><code class="prism language-python">@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/login"</span><span class="token punctuation">,</span> methods<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">'GET'</span><span class="token punctuation">,</span> <span class="token string">'POST'</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">login</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
	<span class="token comment">#方式1</span>
	<span class="token comment"># user_info = request.form.to_dict()</span>
    <span class="token comment"># if user_info.get("username") == "admin" and user_info.get("password") == '123456':</span>
    <span class="token comment">#   return redirect("/")</span>
    <span class="token comment">#方式2</span>
    username <span class="token operator">=</span> request<span class="token punctuation">.</span>form<span class="token punctuation">.</span>get<span class="token punctuation">(</span><span class="token string">"username"</span><span class="token punctuation">)</span>
    password <span class="token operator">=</span> request<span class="token punctuation">.</span>form<span class="token punctuation">.</span>get<span class="token punctuation">(</span><span class="token string">"password"</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> username <span class="token operator">==</span> <span class="token string">"admin"</span> <span class="token operator">and</span> password <span class="token operator">==</span> <span class="token string">"123456"</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"index.html"</span><span class="token punctuation">,</span> title<span class="token operator">=</span><span class="token string">"登录成功"</span><span class="token punctuation">)</span>
    <span class="token keyword">elif</span> request<span class="token punctuation">.</span>method <span class="token operator">==</span> <span class="token string">'GET'</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"login.html"</span><span class="token punctuation">)</span>
    <span class="token keyword">else</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"login.html"</span><span class="token punctuation">,</span> msg<span class="token operator">=</span><span class="token string">"账号密码错误"</span><span class="token punctuation">)</span>
</code></pre> 
  <p>然后我们测试账号密码登录：账号密码错误提示<br> <a href="http://img.e-com-net.com/image/info8/b7b7c556b5854518a6614cfd82478bfd.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/b7b7c556b5854518a6614cfd82478bfd.jpg" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第13张图片" width="650" height="123" style="border:1px solid black;"></a>账号密码正确提示<br> <a href="http://img.e-com-net.com/image/info8/05c7f029358b40be834a014f7a524ff2.png" target="_blank"><img src="http://img.e-com-net.com/image/info8/05c7f029358b40be834a014f7a524ff2.png" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第14张图片" width="555" height="197" style="border:1px solid black;"></a><br> 这里我们要获取前端传给我们得数据就需要使用到request.form.get(“变量名”)函数<br> 前端传给后端数据需要使用到提交按钮以及数据块</p> 
  <h2>上传文件到后端</h2> 
  <p>新建一个file页面内容为：</p> 
  <pre><code class="prism language-html"><span class="token doctype"><!DOCTYPE html></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>文件上传<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
    <form align = "center" action="#" method="post" enctype="multipart/form-data">
        文件：<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>file<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>files<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>上传<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre> 
  <p>新建一个路由内容为：</p> 
  <pre><code class="prism language-python">@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">"/file"</span><span class="token punctuation">,</span> methods<span class="token operator">=</span><span class="token punctuation">(</span><span class="token string">"GET"</span><span class="token punctuation">,</span> <span class="token string">"POST"</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">updateFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    <span class="token keyword">if</span> request<span class="token punctuation">.</span>method <span class="token operator">==</span> <span class="token string">"POST"</span><span class="token punctuation">:</span>
        <span class="token comment"># 获取上传文件数据</span>
        <span class="token builtin">file</span> <span class="token operator">=</span> request<span class="token punctuation">.</span>files<span class="token punctuation">.</span>get<span class="token punctuation">(</span><span class="token string">'files'</span><span class="token punctuation">)</span>
        <span class="token comment"># 保存文件到根目录</span>
        <span class="token builtin">file</span><span class="token punctuation">.</span>save<span class="token punctuation">(</span><span class="token builtin">file</span><span class="token punctuation">.</span>filename<span class="token punctuation">)</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"file.html"</span><span class="token punctuation">)</span>
    <span class="token keyword">else</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"file.html"</span><span class="token punctuation">)</span>
</code></pre> 
  <p>实现效果<br> <a href="http://img.e-com-net.com/image/info8/3f36b5ca7c0e403281403a28a4ec73dd.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/3f36b5ca7c0e403281403a28a4ec73dd.jpg" alt="在这里插入图片描述" width="650" height="99"></a><a href="http://img.e-com-net.com/image/info8/7d2a139df7534e95bb79386472405f2a.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/7d2a139df7534e95bb79386472405f2a.jpg" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第15张图片" width="310" height="342" style="border:1px solid black;"></a>到这里我们就实现了Flask框架的前后端变量传送，文件上传，网页返回内容，更多得知识需要阅读开发手册进行查看！下面我们来通过已学得知识来做一个简单的登录页面</p> 
  <h2>实战：实现一个简单的登录页面</h2> 
  <p><strong>init</strong>.py</p> 
  <pre><code class="prism language-python"><span class="token comment"># 这里注意导包的顺序不能错乱</span>
<span class="token keyword">from</span> flask <span class="token keyword">import</span> Flask
<span class="token comment"># 创建app应用,__name__是python预定义变量，被设置为使用本模块.</span>
app <span class="token operator">=</span> Flask<span class="token punctuation">(</span>__name__<span class="token punctuation">)</span>
<span class="token keyword">from</span> app <span class="token keyword">import</span> routes
</code></pre> 
  <p>templates文件中得index文件<br> Index.html</p> 
  <pre><code class="prism language-html"><span class="token doctype"><!DOCTYPE html></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>巴拉巴拉巴拉~~~~我也不知道取什么<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>link</span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>stylesheet<span class="token punctuation">"</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>static/css/style.css<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>content<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>form sign-in<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>欢迎回来<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
            
            <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span> <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span><span class="token punctuation">></span></span>用户名<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span><span class="token punctuation">></span></span>密码<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>userpwd<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
                <span class="token comment"><!-- <p class="forgot-pass"><a href="javascript:">忘记密码？</a></p> --></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>登 录<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span><span class="token punctuation">></span></span>{
    {msg}}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>

        <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>sub-cont<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>img<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>img__text m--up<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>还未注册？<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>立即注册，发现大量机会！<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>img__text m--in<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>已有帐号？<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>有帐号就登录吧，好久不见了！<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>img__btn<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>m--up<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>注 册<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>m--in<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>登 录<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>form sign-up<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>立即注册<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span> <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span><span class="token punctuation">></span></span>
                        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span><span class="token punctuation">></span></span>用户名<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
                        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>name<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
                    <span class="token comment"><!-- <label>
                        <span>邮箱</span>
                        <input type="email" />
                    </label> --></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span><span class="token punctuation">></span></span>
                        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span><span class="token punctuation">></span></span>密码<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
                        <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>pwd<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>注 册<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>static/js/script.js<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token script language-javascript"></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
	
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre> 
  <p>然后我们再在工程文件中新建一个static文件夹用来存放网页得静态文件（js,css,img）<br> 目录结构：<br> static<br> js<br> script.js<br> css<br> stylle.css<br> images<br> bg.jpg<br> stylle.css</p> 
  <pre><code class="prism language-html">*,
*:before,
*:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
  background: #ededed;
}

input,
button {
  border: none;
  outline: none;
  background: none;
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
}

.tip {
  font-size: 20px;
  margin: 40px auto 50px;
  text-align: center;
}

.content {
  overflow: hidden;
  position: absolute;
  left: 50%;
  top: 50%;
  width: 900px;
  height: 550px;
  margin: -300px 0 0 -450px;
  background: #fff;
}

.form {
  position: relative;
  width: 640px;
  height: 100%;
  transition: -webkit-transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out;
  padding: 100px 30px 0;
}

.sub-cont {
  overflow: hidden;
  position: absolute;
  left: 640px;
  top: 0;
  width: 900px;
  height: 100%;
  padding-left: 260px;
  background: #fff;
  transition: -webkit-transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out;
}

.content.s--signup .sub-cont {
  -webkit-transform: translate3d(-640px, 0, 0);
  transform: translate3d(-640px, 0, 0);
}

button {
  display: block;
  margin: 0 auto;
  width: 260px;
  height: 36px;
  border-radius: 30px;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.img {
  overflow: hidden;
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 260px;
  height: 100%;
  padding-top: 360px;
}

.img:before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 900px;
  height: 100%;
  background-image: url(../images/bg.jpg);
  background-size: cover;
  transition: -webkit-transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out;
}

.img:after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
}

.content.s--signup .img:before {
  -webkit-transform: translate3d(640px, 0, 0);
  transform: translate3d(640px, 0, 0);
}

.img__text {
  z-index: 2;
  position: absolute;
  left: 0;
  top: 50px;
  width: 100%;
  padding: 0 20px;
  text-align: center;
  color: #fff;
  transition: -webkit-transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out;
  transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out;
}

.img__text h2 {
  margin-bottom: 10px;
  font-weight: normal;
}

.img__text p {
  font-size: 14px;
  line-height: 1.5;
}

.content.s--signup .img__text.m--up {
  -webkit-transform: translateX(520px);
  transform: translateX(520px);
}
.img__text.m--in {
  -webkit-transform: translateX(-520px);
  transform: translateX(-520px);
}

.content.s--signup .img__text.m--in {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

.img__btn {
  overflow: hidden;
  z-index: 2;
  position: relative;
  width: 100px;
  height: 36px;
  margin: 0 auto;
  background: transparent;
  color: #fff;
  text-transform: uppercase;
  font-size: 15px;
  cursor: pointer;
}
.img__btn:after {
  content: "";
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  border: 2px solid #fff;
  border-radius: 30px;
}

.img__btn span {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  transition: -webkit-transform 0.6s;
  transition: transform 0.6s;
  transition: transform 0.6s, -webkit-transform 0.6s;
}

.img__btn span.m--in {
  -webkit-transform: translateY(-72px);
  transform: translateY(-72px);
}

.content.s--signup .img__btn span.m--in {
  -webkit-transform: translateY(0);
  transform: translateY(0);
}

.content.s--signup .img__btn span.m--up {
  -webkit-transform: translateY(72px);
  transform: translateY(72px);
}

h2 {
  width: 100%;
  font-size: 26px;
  text-align: center;
}

label {
  display: block;
  width: 260px;
  margin: 25px auto 0;
  text-align: center;
}

label span {
  font-size: 12px;
  color: #909399;
  text-transform: uppercase;
}

input {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding-bottom: 5px;
  font-size: 16px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.4);
  text-align: center;
}

.forgot-pass {
  margin-top: 15px;
  text-align: center;
  font-size: 12px;
  color: #cfcfcf;
}

.forgot-pass a {
  color: #cfcfcf;
}

.submit {
  margin-top: 40px;
  margin-bottom: 20px;
  background: #d4af7a;
  text-transform: uppercase;
}

.fb-btn {
  border: 2px solid #d3dae9;
  color: #8fa1c7;
}
.fb-btn span {
  font-weight: bold;
  color: #455a81;
}

.sign-in {
  transition-timing-function: ease-out;
}
.content.s--signup .sign-in {
  transition-timing-function: ease-in-out;
  transition-duration: 0.3s;
  -webkit-transform: translate3d(640px, 0, 0);
  transform: translate3d(640px, 0, 0);
}

.sign-up {
  -webkit-transform: translate3d(-900px, 0, 0);
  transform: translate3d(-900px, 0, 0);
}
.content.s--signup .sign-up {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

</code></pre> 
  <p>script.js</p> 
  <pre><code class="prism language-html">document.querySelector('.img__btn').addEventListener('click', function() {
    document.querySelector('.content').classList.toggle('s--signup')
})
</code></pre> 
  <p>bg.jpg<br> <a href="http://img.e-com-net.com/image/info8/0ecd8974643c43ce86c28d1a5d1ba6e8.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/0ecd8974643c43ce86c28d1a5d1ba6e8.jpg" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第16张图片" width="650" height="436" style="border:1px solid black;"></a>routes.py</p> 
  <pre><code class="prism language-python"><span class="token comment"># 从app模块中即从__init__.py中导入创建的app应用</span>
<span class="token keyword">from</span> app <span class="token keyword">import</span> app
<span class="token keyword">from</span> flask <span class="token keyword">import</span> render_template
<span class="token keyword">from</span> flask <span class="token keyword">import</span> request
<span class="token comment"># 建立路由，通过路由可以执行其覆盖的方法，可以多个路由指向同一个方法。</span>


@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">'/'</span><span class="token punctuation">,</span> methods<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">'POST'</span><span class="token punctuation">,</span> <span class="token string">'GET'</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">'/index'</span><span class="token punctuation">,</span> methods<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">'POST'</span><span class="token punctuation">,</span> <span class="token string">'GET'</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">index</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    username <span class="token operator">=</span> request<span class="token punctuation">.</span>form<span class="token punctuation">.</span>get<span class="token punctuation">(</span><span class="token string">"username"</span><span class="token punctuation">)</span>
    userpwd <span class="token operator">=</span> request<span class="token punctuation">.</span>form<span class="token punctuation">.</span>get<span class="token punctuation">(</span><span class="token string">"userpwd"</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> username <span class="token operator">==</span> <span class="token string">"stylle"</span> <span class="token operator">and</span> userpwd <span class="token operator">==</span> <span class="token string">"daikongjun"</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"user.html"</span><span class="token punctuation">)</span>
    <span class="token keyword">elif</span> request<span class="token punctuation">.</span>method <span class="token operator">==</span> <span class="token string">'GET'</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"index.html"</span><span class="token punctuation">)</span>
    <span class="token keyword">else</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"index.html"</span><span class="token punctuation">,</span> msg<span class="token operator">=</span><span class="token string">"登录失败"</span><span class="token punctuation">)</span>


@app<span class="token punctuation">.</span>route<span class="token punctuation">(</span><span class="token string">'/user'</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">getUser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    <span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"user.html"</span><span class="token punctuation">)</span>
</code></pre> 
  <p>run.py</p> 
  <pre><code class="prism language-python"><span class="token comment"># 从app模块中导入app应用</span>
<span class="token keyword">from</span> app <span class="token keyword">import</span> app

<span class="token comment"># 防止被引用后执行，只有在当前模块中才可以使用</span>
<span class="token keyword">if</span> __name__ <span class="token operator">==</span> <span class="token string">'__main__'</span><span class="token punctuation">:</span>
    app<span class="token punctuation">.</span>run<span class="token punctuation">(</span>host<span class="token operator">=</span><span class="token string">'0.0.0.0'</span><span class="token punctuation">,</span> port<span class="token operator">=</span><span class="token number">80</span><span class="token punctuation">)</span>
</code></pre> 
  <p>然后我们部署到服务器通过公网ip访问效果<br> <a href="http://img.e-com-net.com/image/info8/22e83e21cd874d748d93b47acd7f710e.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/22e83e21cd874d748d93b47acd7f710e.jpg" alt="Python的Flask框架的学习笔记（前后端变量传送，文件上传，网页返回）内含实战：实现一个简单的登录页面_第17张图片" width="650" height="413" style="border:1px solid black;"></a></p> 
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                        <div>为了根据文本长度动态调整水印字体大小，可以先测量文本长度，然后根据页面宽度和高度动态计算合适的字体大小。以下是修改后的代码：fromreportlab.pdfgenimportcanvasfromreportlab.lib.pagesizesimportletterfromreportlab.pdfbase.ttfontsimportTTFontfromreportlab.pdfbaseimpor</div>
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                        <span class="text-muted">大数据张老师</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
                        <div>Python定义类的属性在Python的面向对象编程中，类的属性是用来描述类和对象的特征和数据的。类的属性可以分为两种：类属性和实例属性。本节将专注于如何定义类的属性，并讲解类属性和实例属性的区别与用法。什么是类的属性类的属性是用来存储数据的变量，它们可以在类的定义中直接声明。属性的主要作用是让类或对象能够存储数据，从而为行为（方法）提供数据支持。在类的内部，属性的定义和操作可以使用与普通变量类似</div>
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                        <span class="text-muted">重剑无锋1024</span>
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                        <div>提示：文章写完后，目录可以自动生成，如何生成可参考右边的帮助文档python实现excel和word自动化--批量处理前言--需求快要期末了需要，提交一个年级的学生成绩数据，也就是几百份。当前我们收集了一份excel表格，它里面有学生的班级、姓名、成绩等信息。问题1：每个学生一个docx要有不同的文件名，要把文件名为班级+姓名（图片未改）问题2：每个docx文件中需要填写一些不一样的东西比如文件里</div>
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                        <span class="text-muted">重剑无锋1024</span>
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                        <div>提示：文章写完后，目录可以自动生成，如何生成可参考右边的帮助文档《python爬虫入门教程12--selenium的安装与使用》selenium就是一个可以实现python自动化的模块，上次我们更新了如何安装以及它的语法。同时我也更新了如何用爬虫技术实现cookie免登录12306，再用selenium自动抢票。这个帖子主要是对selenium的一个语法讲解小案例，大家可以多运行试试。[免登录12</div>
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                        <span class="text-muted">重剑无锋1024</span>
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                        <div>提示：文章写完后，目录可以自动生成，如何生成可参考右边的帮助文档《python爬虫入门教程12--selenium的安装与使用》selenium就是一个可以实现python自动化的模块，上次我们更新了如何安装，这次我们来具体看看，它的语法，大家可以自己尝试一下，我的代码直接放在下面。前言一、selenium八种定位元素的方法1.完整示例代码二、总结。掌握这几种方法再在它们后面加入.click()或</div>
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                        <span class="text-muted">可以证明.</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
                        <div>题目：一个点从数轴的原点开始运动，通过投掷骰子决定运动方向：若出现1，4面之一时，向负方向移动1个单位；若出现2，3，5，6面之一时，向正方向移动2个单位，（1）投掷1次骰子，该点位置的平均值为（）（2）投掷6次骰子后，概率大于的点的位置存在的最小区间为（）答案：1，[3,9]importrandom#投掷骰子的模拟defroll_dice():returnrandom.randint(1,6)#</div>
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                        <span class="text-muted">shanks66</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
                        <div>@[toc]python对象Object在Python中，对象（Object）是面向对象编程（OOP）的核心概念。对象是类的实例，类定义了对象的属性和行为。Python中的一切都是对象，包括数字、字符串、列表、函数等。对象的基本概念类（Class）：类是对象的蓝图或模板，定义了对象的属性和方法。通过类可以创建多个对象。对象（Object）：对象是类的实例，具有类定义的属性和方法。每个对象都有自己的</div>
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                        <span class="text-muted">python狂徒</span>
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                        <span class="text-muted">啊吧啊吧，</span>
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                        <div>1.在字符串开头的引导前加f或F，可以在{}中输入引用的变量age=20name='张三'a=f'Heis{name}{age}'print(a)2.想快速显示变量进行调试，可以用repr()或str()函数把值转化为字符串a='watchtv'print(str(a))print(repr(a))3.生成一组整齐的列，包含给定整数及其平方与立方</div>
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                        <div>点这里去解决这道题Go!题目描述单词接龙的规则是：可用于接龙的单词首字母必须要前一个单词的尾字母相同；当存在多个首字母相同的单词时，取长度最长的单词，如果长度也相等，则取字典序最小的单词；已经参与接龙的单词不能重复使用。现给定一组全部由小写字母组成单词数组，并指定其中的一个单词作为起始单词，进行单词接龙，请输出最长的单词串，单词串是单词拼接而成，中间没有空格。输入描述输入的第一行为一个非负整数，表</div>
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                        <span class="text-muted">14_11</span>
<a class="tag" taget="_blank" href="/search/Cherno/1.htm">Cherno</a><a class="tag" taget="_blank" href="/search/C%2B%2B%E5%AD%A6%E4%B9%A0/1.htm">C++学习</a><a class="tag" taget="_blank" href="/search/%E5%AD%A6%E4%B9%A0/1.htm">学习</a><a class="tag" taget="_blank" href="/search/%E7%AC%94%E8%AE%B0/1.htm">笔记</a><a class="tag" taget="_blank" href="/search/c%2B%2B/1.htm">c++</a>
                        <div>这篇文章我们会讲一下C++模板，这个是一个非常有意思的且有用的东西，我们平时使用的STL其实就是基于模板编写的。它几乎就像一个宏，可以去做我们想做的任何事情。模板也可以称其为泛型，但是它比泛型要强大得多。模板是一个非常非常大的话题，所以这里我们只会讲解它简单的应用。它的本质是可以根据我们自己的用途，为其定义一个模板，然后编译器会根据我们给出的规则来帮助我们编写代码，可以让我们省去很多麻烦。所以使用</div>
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                        <span class="text-muted">weixin_34289744</span>
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                        <span class="text-muted">宁君</span>
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                        <div>1.第一种方法电脑下载安装ffmpeg方法见mac电脑安装ffmpeg两种方法然后代码如下frommoviepy.editorimportVideoFileClipimportosimportffmpegdefconvert_video_to_mp4(input_video_path,output_video_path):'''速度慢,CPU狂飙:paraminput_video_path::pa</div>
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                        <span class="text-muted">臨鱼羡上天</span>
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                        <div>python实现自动登录12306抢票--selenium前言其实网上也出现了很多12306的代码，但是都不是最新的，我也是从网上找别人的帖子，看B站视频，然后写成了这个程序，想分享一下。其中我会说自己遇到的问题以及自己的一个改进。一、遇到的问题？1.url-正确的表头：就是首先url不要写错了，然后一定要加正确的表头，才可以拿到数据，就是我日期填写错误，然后生成的url就有问题，浪费了好多时间。</div>
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                    <li><a href="/article/1879836661639081984.htm"
                           title="Python单例模式中的问题" target="_blank">Python单例模式中的问题</a>
                        <span class="text-muted"></span>
<a class="tag" taget="_blank" href="/search/%E5%90%8E%E7%AB%AFpython/1.htm">后端python</a>
                        <div>一、装饰器形式的单例模式首先先给出Python中装饰器的单例模式：python代码解读复制代码importthreadingdefsingleton(cls):_instances={}_lock=threading.Lock()defget_instance(*args,**kwargs):ifclsnotin_instances:with_lock:ifclsnotin_instances:_</div>
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                    <li><a href="/article/1879836530592247808.htm"
                           title="《CPython Internals》阅读笔记：p118-p150" target="_blank">《CPython Internals》阅读笔记：p118-p150</a>
                        <span class="text-muted"></span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
                        <div>《CPythonInternals》学习第8天，p118-p150总结，总计33页。一、技术总结补充一些本人整理的关于Context-FreeGrammar(CFG)的知识。1.symbol(符号)Amathematicalsymbolisafigureoracombinationoffiguresthatisusedtorepresentamathematicalobject（符号是一个数字或数</div>
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                    <li><a href="/article/1879836403311898624.htm"
                           title="巧夺天工：VSCode Python 终端环境隔离的背后原理" target="_blank">巧夺天工：VSCode Python 终端环境隔离的背后原理</a>
                        <span class="text-muted"></span>

                        <div>每个写Python的小伙伴都会感慨，VSCode对Python环境的支持太好了！当你切换Python解释器后，新开的终端会自动激活对应的环境，不同项目互不干扰，用起来简直不要太舒服。但是，你知道这背后的实现原理吗？终端环境隔离的本质：环境变量首先，我们要理解终端中环境激活的本质。当我们在终端中执行sourcevenv/bin/activate或condaactivateenv_name时，这些命令</div>
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                    <li><a href="/article/1879836150386978816.htm"
                           title="为什么在 Python 中 hash(-1) == hash(-2)?" target="_blank">为什么在 Python 中 hash(-1) == hash(-2)?</a>
                        <span class="text-muted"></span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
                        <div>英文：https://omairmajid.com/posts/2021-07-16-why-is-hash-in-python作者：OmairMajid译者：豌豆花下猫&Claude-3.5-Sonnet时间：原文发布于2021.07.16，翻译于2025.01.11收录于：Python为什么系列https://github.com/chinesehuazhou/python-whydo当我在等</div>
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                                <li><a href="/article/109.htm"
                                       title="统一思想认识" target="_blank">统一思想认识</a>
                                    <span class="text-muted">永夜-极光</span>
<a class="tag" taget="_blank" href="/search/%E6%80%9D%E6%83%B3/1.htm">思想</a>
                                    <div>1.统一思想认识的基础,才能有的放矢 
 原因: 
   总有一种描述事物的方式最贴近本质,最容易让人理解. 
   如何让教育更轻松,在于找到最适合学生的方式. 
         难点在于,如何模拟对方的思维基础选择合适的方式.   &</div>
                                </li>
                                <li><a href="/article/236.htm"
                                       title="Joda Time使用笔记" target="_blank">Joda Time使用笔记</a>
                                    <span class="text-muted">bylijinnan</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/joda+time/1.htm">joda time</a>
                                    <div>Joda Time的介绍可以参考这篇文章： 
 
http://www.ibm.com/developerworks/cn/java/j-jodatime.html 
 
工作中也常常用到Joda Time，为了避免每次使用都查API，记录一下常用的用法： 
    
 
   /**
     * DateTime变化（增减）
     */
    @Tes</div>
                                </li>
                                <li><a href="/article/363.htm"
                                       title="FileUtils API" target="_blank">FileUtils API</a>
                                    <span class="text-muted">eksliang</span>
<a class="tag" taget="_blank" href="/search/FileUtils/1.htm">FileUtils</a><a class="tag" taget="_blank" href="/search/FileUtils+API/1.htm">FileUtils API</a>
                                    <div>转载请出自出处：http://eksliang.iteye.com/blog/2217374 一、概述 
这是一个Java操作文件的常用库，是Apache对java的IO包的封装，这里面有两个非常核心的类FilenameUtils跟FileUtils，其中FilenameUtils是对文件名操作的封装;FileUtils是文件封装，开发中对文件的操作，几乎都可以在这个框架里面找到。 非常的好用。 </div>
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                                <li><a href="/article/490.htm"
                                       title="各种新兴技术" target="_blank">各种新兴技术</a>
                                    <span class="text-muted">不懂事的小屁孩</span>
<a class="tag" taget="_blank" href="/search/%E6%8A%80%E6%9C%AF/1.htm">技术</a>
                                    <div>1:gradle Gradle 是以 Groovy 语言为基础，面向Java应用为主。基于DSL（领域特定语言）语法的自动化构建工具。 
 
现在构建系统常用到maven工具，现在有更容易上手的gradle， 
搭建java环境:
http://www.ibm.com/developerworks/cn/opensource/os-cn-gradle/ 
搭建android环境：
http://m</div>
                                </li>
                                <li><a href="/article/617.htm"
                                       title="tomcat6的https双向认证" target="_blank">tomcat6的https双向认证</a>
                                    <span class="text-muted">酷的飞上天空</span>
<a class="tag" taget="_blank" href="/search/tomcat6/1.htm">tomcat6</a>
                                    <div>1.生成服务器端证书 
  
keytool -genkey -keyalg RSA -dname "cn=localhost,ou=sango,o=none,l=china,st=beijing,c=cn" -alias server -keypass password -keystore server.jks -storepass password -validity 36</div>
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                                <li><a href="/article/744.htm"
                                       title="托管虚拟桌面市场势不可挡" target="_blank">托管虚拟桌面市场势不可挡</a>
                                    <span class="text-muted">蓝儿唯美</span>

                                    <div>用户还需要冗余的数据中心，dinCloud的高级副总裁兼首席营销官Ali Din指出。该公司转售一个MSP可以让用户登录并管理和提供服务的用于DaaS的云自动化控制台，提供服务或者MSP也可以自己来控制。 
在某些情况下，MSP会在dinCloud的云服务上进行服务分层，如监控和补丁管理。 
MSP的利润空间将根据其参与的程度而有所不同，Din说。 
“我们有一些合作伙伴负责将我们推荐给客户作为个</div>
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                                <li><a href="/article/871.htm"
                                       title="spring学习——xml文件的配置" target="_blank">spring学习——xml文件的配置</a>
                                    <span class="text-muted">a-john</span>
<a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a>
                                    <div>在Spring的学习中，对于其xml文件的配置是必不可少的。在Spring的多种装配Bean的方式中，采用XML配置也是最常见的。以下是一个简单的XML配置文件： 
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.or</div>
                                </li>
                                <li><a href="/article/998.htm"
                                       title="HDU 4342 History repeat itself 模拟" target="_blank">HDU 4342 History repeat itself 模拟</a>
                                    <span class="text-muted">aijuans</span>
<a class="tag" taget="_blank" href="/search/%E6%A8%A1%E6%8B%9F/1.htm">模拟</a>
                                    <div>来源：http://acm.hdu.edu.cn/showproblem.php?pid=4342 
题意：首先让求第几个非平方数，然后求从1到该数之间的每个sqrt(i)的下取整的和。 
思路：一个简单的模拟题目，但是由于数据范围大，需要用__int64。我们可以首先把平方数筛选出来，假如让求第n个非平方数的话，看n前面有多少个平方数，假设有x个，则第n个非平方数就是n+x。注意两种特殊情况，即</div>
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                                <li><a href="/article/1125.htm"
                                       title="java中最常用jar包的用途" target="_blank">java中最常用jar包的用途</a>
                                    <span class="text-muted">asia007</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a>
                                    <div>java中最常用jar包的用途 
jar包用途axis.jarSOAP引擎包commons-discovery-0.2.jar用来发现、查找和实现可插入式接口，提供一些一般类实例化、单件的生命周期管理的常用方法.jaxrpc.jarAxis运行所需要的组件包saaj.jar创建到端点的点到点连接的方法、创建并处理SOAP消息和附件的方法，以及接收和处理SOAP错误的方法.  w</div>
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                                <li><a href="/article/1252.htm"
                                       title="ajax获取Struts框架中的json编码异常和Struts中的主控制器异常的解决办法" target="_blank">ajax获取Struts框架中的json编码异常和Struts中的主控制器异常的解决办法</a>
                                    <span class="text-muted">百合不是茶</span>
<a class="tag" taget="_blank" href="/search/js/1.htm">js</a><a class="tag" taget="_blank" href="/search/json%E7%BC%96%E7%A0%81%E8%BF%94%E5%9B%9E%E5%BC%82%E5%B8%B8/1.htm">json编码返回异常</a>
                                    <div>一:ajax获取自定义Struts框架中的json编码  出现以下 问题:     
  
1,强制flush输出  json编码打印在首页 
2, 不强制flush js会解析json 打印出来的是错误的jsp页面   却没有跳转到错误页面 
3,  ajax中的dataType的json 改为text 会</div>
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                                <li><a href="/article/1379.htm"
                                       title="JUnit使用的设计模式" target="_blank">JUnit使用的设计模式</a>
                                    <span class="text-muted">bijian1013</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/1.htm">设计模式</a><a class="tag" taget="_blank" href="/search/JUnit/1.htm">JUnit</a>
                                    <div>JUnit源代码涉及使用了大量设计模式 
1、模板方法模式（Template Method） 
        定义一个操作中的算法骨架，而将一些步骤延伸到子类中去，使得子类可以不改变一个算法的结构，即可重新定义该算法的某些特定步骤。这里需要复用的是算法的结构，也就是步骤，而步骤的实现可以在子类中完成。 
  </div>
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                                <li><a href="/article/1506.htm"
                                       title="Linux常用命令（摘录）" target="_blank">Linux常用命令（摘录）</a>
                                    <span class="text-muted">sunjing</span>
<a class="tag" taget="_blank" href="/search/crond/1.htm">crond</a><a class="tag" taget="_blank" href="/search/chkconfig/1.htm">chkconfig</a>
                                    <div>chkconfig --list   查看linux所有服务 
chkconfig --add servicename 添加linux服务 
netstat -apn | grep 8080  查看端口占用 
env 查看所有环境变量 
echo $JAVA_HOME 查看JAVA_HOME环境变量 
  
安装编译器 
yum install -y gcc</div>
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                                <li><a href="/article/1633.htm"
                                       title="【Hadoop一】Hadoop伪集群环境搭建" target="_blank">【Hadoop一】Hadoop伪集群环境搭建</a>
                                    <span class="text-muted">bit1129</span>
<a class="tag" taget="_blank" href="/search/hadoop/1.htm">hadoop</a>
                                    <div> 结合网上多份文档，不断反复的修正hadoop启动和运行过程中出现的问题，终于把Hadoop2.5.2伪分布式安装起来，跑通了wordcount例子。Hadoop的安装复杂性的体现之一是，Hadoop的安装文档非常多，但是能一个文档走下来的少之又少，尤其是Hadoop不同版本的配置差异非常的大。Hadoop2.5.2于前两天发布，但是它的配置跟2.5.0，2.5.1没有分别。   &nb</div>
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                                <li><a href="/article/1760.htm"
                                       title="Anychart图表系列五之事件监听" target="_blank">Anychart图表系列五之事件监听</a>
                                    <span class="text-muted">白糖_</span>
<a class="tag" taget="_blank" href="/search/chart/1.htm">chart</a>
                                    <div>创建图表事件监听非常简单：首先是通过addEventListener('监听类型',js监听方法)添加事件监听，然后在js监听方法中定义具体监听逻辑。 
以钻取操作为例，当用户点击图表某一个point的时候弹出point的name和value，代码如下： 
<script>
//创建AnyChart
var chart = new AnyChart();
//添加钻取操作&quo</div>
                                </li>
                                <li><a href="/article/1887.htm"
                                       title="Web前端相关段子" target="_blank">Web前端相关段子</a>
                                    <span class="text-muted">braveCS</span>
<a class="tag" taget="_blank" href="/search/web%E5%89%8D%E7%AB%AF/1.htm">web前端</a>
                                    <div>Web标准：结构、样式和行为分离 
  
使用语义化标签 
0）标签的语义：使用有良好语义的标签，能够很好地实现自我解释，方便搜索引擎理解网页结构，抓取重要内容。去样式后也会根据浏览器的默认样式很好的组织网页内容，具有很好的可读性，从而实现对特殊终端的兼容。 
1）div和span是没有语义的：只是分别用作块级元素和行内元素的区域分隔符。当页面内标签无法满足设计需求时，才会适当添加div</div>
                                </li>
                                <li><a href="/article/2014.htm"
                                       title="编程之美-24点游戏" target="_blank">编程之美-24点游戏</a>
                                    <span class="text-muted">bylijinnan</span>
<a class="tag" taget="_blank" href="/search/%E7%BC%96%E7%A8%8B%E4%B9%8B%E7%BE%8E/1.htm">编程之美</a>
                                    <div>

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Random;
import java.util.Set;


public class PointGame {

	/**编程之美 </div>
                                </li>
                                <li><a href="/article/2141.htm"
                                       title="主页面子页面传值总结" target="_blank">主页面子页面传值总结</a>
                                    <span class="text-muted">chengxuyuancsdn</span>
<a class="tag" taget="_blank" href="/search/%E6%80%BB%E7%BB%93/1.htm">总结</a>
                                    <div>1、showModalDialog
returnValue是javascript中html的window对象的属性,目的是返回窗口值,当用window.showModalDialog函数打开一个IE的模式窗口时,用于返回窗口的值
主界面
 var sonValue=window.showModalDialog("son.jsp");
子界面
  window.retu</div>
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                                <li><a href="/article/2268.htm"
                                       title="[网络与经济]互联网+的含义" target="_blank">[网络与经济]互联网+的含义</a>
                                    <span class="text-muted">comsci</span>
<a class="tag" taget="_blank" href="/search/%E4%BA%92%E8%81%94%E7%BD%91%2B/1.htm">互联网+</a>
                                    <div> 
      互联网+后面是一个人的名字 = 网络控制系统 
 
      互联网+你的名字 =  网络个人数据库 
 
      每日提示:如果人觉得不舒服,千万不要外出到处走动,就呆在床上,玩玩手游,更不能够去开车,现在交通状况不</div>
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                                <li><a href="/article/2395.htm"
                                       title="oracle 创建视图 with check option" target="_blank">oracle 创建视图 with check option</a>
                                    <span class="text-muted">daizj</span>
<a class="tag" taget="_blank" href="/search/%E8%A7%86%E5%9B%BE/1.htm">视图</a><a class="tag" taget="_blank" href="/search/view/1.htm">view</a><a class="tag" taget="_blank" href="/search/oralce/1.htm">oralce</a>
                                    <div>我们来看下面的例子： 
create or replace view testview 
as 
select empno,ename from emp where ename like ‘M%’ 
with check option; 
 
这里我们创建了一个视图，并使用了with check option来限制了视图。 然后我们来看一下视图包含的结果： 
select * from testv</div>
                                </li>
                                <li><a href="/article/2522.htm"
                                       title="ToastPlugin插件在cordova3.3下使用" target="_blank">ToastPlugin插件在cordova3.3下使用</a>
                                    <span class="text-muted">dibov</span>
<a class="tag" taget="_blank" href="/search/Cordova/1.htm">Cordova</a>
                                    <div>    自己开发的Todos应用，想实现“ 
再按一次返回键退出程序 ”的功能，采用网上的ToastPlugins插件，发现代码或文章基本都是老版本，运行问题比较多。折腾了好久才弄好。下面吧基于cordova3.3下的ToastPlugins相关代码共享。      
    ToastPlugin.java        
package&nbs</div>
                                </li>
                                <li><a href="/article/2649.htm"
                                       title="C语言22个系统函数" target="_blank">C语言22个系统函数</a>
                                    <span class="text-muted">dcj3sjt126com</span>
<a class="tag" taget="_blank" href="/search/c/1.htm">c</a><a class="tag" taget="_blank" href="/search/function/1.htm">function</a>
                                    <div>C语言系统函数一、数学函数下列函数存放在math.h头文件中Double floor(double num) 求出不大于num的最大数。Double fmod(x, y) 求整数x/y的余数。Double frexp(num, exp); double num; int *exp; 将num分为数字部分（尾数）x和 以2位的指数部分n，即num=x*2n，指数n存放在exp指向的变量中，返回x。D</div>
                                </li>
                                <li><a href="/article/2776.htm"
                                       title="开发一个类的流程" target="_blank">开发一个类的流程</a>
                                    <span class="text-muted">dcj3sjt126com</span>
<a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91/1.htm">开发</a>
                                    <div>本人近日根据自己的开发经验总结了一个类的开发流程。这个流程适用于单独开发的构件，并不适用于对一个项目中的系统对象开发。开发出的类可以存入私人类库，供以后复用。 
  
以下是开发流程： 
1. 明确类的功能，抽象出类的大概结构 
2. 初步设想类的接口 
3. 类名设计（驼峰式命名） 
4. 属性设置(权限设置) 
判断某些变量是否有必要作为成员属</div>
                                </li>
                                <li><a href="/article/2903.htm"
                                       title="java 并发" target="_blank">java 并发</a>
                                    <span class="text-muted">shuizhaosi888</span>
<a class="tag" taget="_blank" href="/search/java+%E5%B9%B6%E5%8F%91/1.htm">java 并发</a>
                                    <div>能够写出高伸缩性的并发是一门艺术 
  
在JAVA SE5中新增了3个包  
 
 java.util.concurrent 
 java.util.concurrent.atomic 
 java.util.concurrent.locks 
  
在java的内存模型中，类的实例字段、静态字段和构成数组的对象元素都会被多个线程所共享，局部变量与方法参数都是线程私有的，不会被共享。 </div>
                                </li>
                                <li><a href="/article/3030.htm"
                                       title="Spring Security（11）——匿名认证" target="_blank">Spring Security（11）——匿名认证</a>
                                    <span class="text-muted">234390216</span>
<a class="tag" taget="_blank" href="/search/Spring+Security/1.htm">Spring Security</a><a class="tag" taget="_blank" href="/search/ROLE_ANNOYMOUS/1.htm">ROLE_ANNOYMOUS</a><a class="tag" taget="_blank" href="/search/%E5%8C%BF%E5%90%8D/1.htm">匿名</a>
                                    <div>匿名认证 
目录 
1.1     配置 
1.2     AuthenticationTrustResolver 
  
       对于匿名访问的用户，Spring Security支持为其建立一个匿名的AnonymousAuthenticat</div>
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                                <li><a href="/article/3157.htm"
                                       title="NODEJS项目实践0.2[ express,ajax通信...]" target="_blank">NODEJS项目实践0.2[ express,ajax通信...]</a>
                                    <span class="text-muted">逐行分析JS源代码</span>
<a class="tag" taget="_blank" href="/search/Ajax/1.htm">Ajax</a><a class="tag" taget="_blank" href="/search/nodejs/1.htm">nodejs</a><a class="tag" taget="_blank" href="/search/express/1.htm">express</a>
                                    <div>  
一、前言 
        通过上节学习，我们已经        ubuntu系统搭建了一个可以访问的nodejs系统，并做了nginx转发。本节原要做web端服务 及 mongodb的存取，但写着写着，web端就</div>
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                                <li><a href="/article/3284.htm"
                                       title="在Struts2 的Action中怎样获取表单提交上来的多个checkbox的值" target="_blank">在Struts2 的Action中怎样获取表单提交上来的多个checkbox的值</a>
                                    <span class="text-muted">lhbthanks</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/html/1.htm">html</a><a class="tag" taget="_blank" href="/search/struts/1.htm">struts</a><a class="tag" taget="_blank" href="/search/checkbox/1.htm">checkbox</a>
                                    <div>第一种方法：获取结果String类型 
在 Action 中获得的是一个 String 型数据，每一个被选中的 checkbox 的 value 被拼接在一起，每个值之间以逗号隔开(,)。 
 
所以在 Action 中定义一个跟 checkbox 的 name 同名的属性来接收这些被选中的 checkbox 的 value 即可。 
以下是实现的代码： 
 前台 HTML 代码： 
 
 
 </div>
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                                       title="003.Kafka基本概念" target="_blank">003.Kafka基本概念</a>
                                    <span class="text-muted">nweiren</span>
<a class="tag" taget="_blank" href="/search/hadoop/1.htm">hadoop</a><a class="tag" taget="_blank" href="/search/kafka/1.htm">kafka</a>
                                    <div>Kafka基本概念：Topic、Partition、Message、Producer、Broker、Consumer。   Topic：               消息源（Message）的分类。   Partition：               Topic物理上的分组，一</div>
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                                <li><a href="/article/3538.htm"
                                       title="Linux环境下安装JDK" target="_blank">Linux环境下安装JDK</a>
                                    <span class="text-muted">roadrunners</span>
<a class="tag" taget="_blank" href="/search/jdk/1.htm">jdk</a><a class="tag" taget="_blank" href="/search/linux/1.htm">linux</a>
                                    <div>1、准备工作 
创建JDK的安装目录： 
mkdir -p /usr/java/ 
  
下载JDK，找到适合自己系统的JDK版本进行下载： 
http://www.oracle.com/technetwork/java/javase/downloads/index.html 
  
把JDK安装包下载到/usr/java/目录，然后进行解压： 
tar -zxvf jre-7</div>
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                                <li><a href="/article/3665.htm"
                                       title="Linux忘记root密码的解决思路" target="_blank">Linux忘记root密码的解决思路</a>
                                    <span class="text-muted">tomcat_oracle</span>
<a class="tag" taget="_blank" href="/search/linux/1.htm">linux</a>
                                    <div>1：使用同版本的linux启动系统，chroot到忘记密码的根分区passwd改密码   　　2：grub启动菜单中加入init=/bin/bash进入系统，不过这时挂载的是只读分区。根据系统的分区情况进一步判断.   　　3: grub启动菜单中加入 single以单用户进入系统.   　　4:用以上方法mount到根分区把/etc/passwd中的root密码去除   　　例如:   　　ro</div>
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                                <li><a href="/article/3792.htm"
                                       title="跨浏览器 HTML5 postMessage 方法以及 message 事件模拟实现" target="_blank">跨浏览器 HTML5 postMessage 方法以及 message 事件模拟实现</a>
                                    <span class="text-muted">xueyou</span>
<a class="tag" taget="_blank" href="/search/jsonp/1.htm">jsonp</a><a class="tag" taget="_blank" href="/search/jquery/1.htm">jquery</a><a class="tag" taget="_blank" href="/search/%E6%A1%86%E6%9E%B6/1.htm">框架</a><a class="tag" taget="_blank" href="/search/UI/1.htm">UI</a><a class="tag" taget="_blank" href="/search/html5/1.htm">html5</a>
                                    <div>postMessage 是 HTML5 新方法，它可以实现跨域窗口之间通讯。到目前为止，只有 IE8+, Firefox 3, Opera 9, Chrome 3和 Safari 4 支持，而本篇文章主要讲述 postMessage 方法与 message 事件跨浏览器实现。postMessage 方法 JSONP 技术不一样，前者是前端擅长跨域文档数据即时通讯，后者擅长针对跨域服务端数据通讯，p</div>
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