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[记录十二] Vue(全家桶)+node+koa2+mysql+nginx+redis，博客全栈项目之管理员界面的编写

导语：
暑假在家闲着无事，就琢磨着做一个web博客练练手，现在已经做完了，把过程分享出来给大家看看，分享一下学习经验。这是第十二篇，前面已经把客户端的界面和功能都做完了，现在写一下管理员界面。
微信搜索 【web小馆】，回复 ”全栈博客项目“，即可获取 项目源码和后续的实战文章教程。
本文的目录

一，管理员界面
1，模板介绍
2，分析代码，编写接口
（1）markdown
（2）如何使用
(3)编写上传接口
（4）获取文章列表接口
一，管理员界面

1，模板介绍

这里我们考虑到开发的速度，我就再网上找了一个开源的后台管理员界面的模板，qadmin，这是一个功能界面都特别丰富的模板。
这里就是这个后台管理界面模板的部分截图，使用起来特别简单，使用jquery就可以了。至于这个模板怎么下载，大家自行在百度搜索“qadmin”就行了，开源下载。
2，分析代码，编写接口

（1）markdown

这里主要是有一个创建文章的markdown编辑器，我就上网搜索下载了一个markdown的编辑器。这个就是它的官网，下载到电脑，接下来教你怎么使用。https://github.com/pandao/editor.md
Editor.md 是一款开源的、可嵌入的 Markdown 在线编辑器（组件），基于 CodeMirror、jQuery 和 Marked 构建。
主要特性

支持通用 Markdown / CommonMark 和 GFM (GitHub Flavored Markdown)

风格的语法，也可变身为代码编辑器；

支持实时预览、图片（跨域）上传、预格式文本/代码/表格插入、代码折叠、跳转到行、搜索替换、只读模式、自定义样式主题和多语言语法高亮等功能；

支持 ToC（Table of Contents）、Emoji表情、Task lists、@链接等 Markdown 扩展语法；支持TeX 科学公式（基于 KaTeX）、流程图 Flowchart 和时序图 Sequence Diagram;

支持识别和解析 HTML标签，并且支持自定义过滤标签及属性解析，具有可靠的安全性和几乎无限的扩展性；

支持 AMD / CMD 模块化加载（支持 Require.js & Sea.js），并且支持自定义扩展插件；

兼容主流的浏览器（IE8+）和 Zepto.js，且支持 iPad 等平板设备；
（2）如何使用

下载后，把文件放在static/markdown中，然后引用即可（注意html里面路径要写对）
这个是编辑页面的编辑栏。
<link rel="stylesheet" href="editor.md/css/editormd.min.css" />
<div id="editor">
    <!-- Tips: Editor.md can auto append a ``</span></span> tag <span class="token operator">--</span><span class="token operator">></span>
    <span class="token operator"><</span>textarea style<span class="token operator">=</span><span class="token string">"display:none;"</span><span class="token operator">></span>### Hello Editor<span class="token punctuation">.</span>md <span class="token operator">!</span><span class="token operator"><</span><span class="token operator">/</span>textarea<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>div<span class="token operator">></span>
<span class="token operator"><</span>script src<span class="token operator">=</span><span class="token string">"jquery.min.js"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
<span class="token operator"><</span>script src<span class="token operator">=</span><span class="token string">"../static/markdown/editor.md/editormd.min.js"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
<span class="token operator"><</span>script type<span class="token operator">=</span><span class="token string">"text/javascript"</span><span class="token operator">></span>
    <span class="token function">$</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">var</span> editor <span class="token operator">=</span> <span class="token function">editormd</span><span class="token punctuation">(</span><span class="token string">"editor"</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
            <span class="token comment">// width: "100%",</span>
            <span class="token comment">// height: "100%",</span>
            <span class="token comment">// markdown: "xxxx",     // dynamic set Markdown text</span>
            path <span class="token punctuation">:</span> <span class="token string">"../static/markdown/editor.md/lib/"</span>  <span class="token comment">// Autoload modules mode, codemirror, marked... dependents libs path</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
</code></pre> 
  <blockquote> 
   <p>这是把提交的文件显示出来</p> 
  </blockquote> 
  <pre><code class="prism language-javascript"><span class="token operator"><</span>link rel<span class="token operator">=</span><span class="token string">"stylesheet"</span> href<span class="token operator">=</span><span class="token string">"editormd/css/editormd.preview.css"</span> <span class="token operator">/</span><span class="token operator">></span>
<span class="token operator"><</span>div id<span class="token operator">=</span><span class="token string">"test-markdown-view"</span><span class="token operator">></span>
    <span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span> Server<span class="token operator">-</span>side output Markdown text <span class="token operator">--</span><span class="token operator">></span>
    <span class="token operator"><</span>textarea style<span class="token operator">=</span><span class="token string">"display:none;"</span><span class="token operator">></span>### Hello world<span class="token operator">!</span><span class="token operator"><</span><span class="token operator">/</span>textarea<span class="token operator">></span>             
<span class="token operator"><</span><span class="token operator">/</span>div<span class="token operator">></span>
<span class="token operator"><</span>script src<span class="token operator">=</span><span class="token string">"jquery.min.js"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
<span class="token operator"><</span>script src<span class="token operator">=</span><span class="token string">"../static/markdown/editormd/editormd.js"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
<span class="token operator"><</span>script src<span class="token operator">=</span><span class="token string">"../static/markdown/editormd/lib/marked.min.js"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
<span class="token operator"><</span>script src<span class="token operator">=</span><span class="token string">"../static/markdown/editormd/lib/prettify.min.js"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>
<span class="token operator"><</span>script type<span class="token operator">=</span><span class="token string">"text/javascript"</span><span class="token operator">></span>
    <span class="token function">$</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	    <span class="token keyword">var</span> testView <span class="token operator">=</span> editormd<span class="token punctuation">.</span><span class="token function">markdownToHTML</span><span class="token punctuation">(</span><span class="token string">"test-markdown-view"</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
            <span class="token comment">// markdown : "[TOC]\n### Hello world!\n## Heading 2", // Also, you can dynamic set Markdown text</span>
            <span class="token comment">// htmlDecode : true,  // Enable / disable HTML tag encode.</span>
            <span class="token comment">// htmlDecode : "style,script,iframe",  // Note: If enabled, you should filter some dangerous HTML tags for website security.</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator"><</span><span class="token operator">/</span>script<span class="token operator">></span>  
</code></pre> 
  <p><a href="http://img.e-com-net.com/image/info8/77b8a9dbd7a04a2c92fe0e01940cca4d.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/77b8a9dbd7a04a2c92fe0e01940cca4d.jpg" alt="[记录十二] Vue(全家桶)+node+koa2+mysql+nginx+redis，博客全栈项目之管理员界面的编写_第4张图片" width="650" height="500" style="border:1px solid black;"></a></p> 
  <h3>(3)编写上传接口</h3> 
  <p>这个模板里面基本都已经把代码写好了，你只需要把一些接口地址给改一下就行了</p> 
  <pre><code class="prism language-javascript"><span class="token comment">//文章缩略图左侧显示图片</span>
upload<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    elem<span class="token punctuation">:</span> <span class="token string">'#pic'</span> <span class="token comment">//绑定元素</span>
    <span class="token punctuation">,</span> url<span class="token punctuation">:</span> <span class="token string">"/api/admin/updata/pic"</span> <span class="token comment">//上传接口  </span>
    <span class="token punctuation">,</span> done<span class="token punctuation">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>res<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//上传完毕回调</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>res<span class="token punctuation">.</span>errno <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">"#pic_url"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">val</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>data<span class="token punctuation">.</span>avatar_url<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">".pic_url"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">"src"</span><span class="token punctuation">,</span> res<span class="token punctuation">.</span>data<span class="token punctuation">.</span>avatar_url<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
            layer<span class="token punctuation">.</span><span class="token function">msg</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>info<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> error<span class="token punctuation">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        layer<span class="token punctuation">.</span><span class="token function">msg</span><span class="token punctuation">(</span><span class="token string">"上传异常"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//文章内容提交</span>
form<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'submit(submit)'</span><span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>data<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> config <span class="token operator">=</span> <span class="token punctuation">{</span>
      headers<span class="token punctuation">:</span> <span class="token punctuation">{</span>
        <span class="token string">'Content-Type'</span><span class="token punctuation">:</span> <span class="token string">'multipart/form-data'</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    
    $<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span>data<span class="token punctuation">.</span>form<span class="token punctuation">.</span>action<span class="token punctuation">,</span> data<span class="token punctuation">.</span>field<span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          layer<span class="token punctuation">.</span><span class="token function">closeAll</span><span class="token punctuation">(</span><span class="token string">'loading'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>e<span class="token punctuation">.</span>errno <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
             layer<span class="token punctuation">.</span><span class="token function">msg</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>msg<span class="token punctuation">,</span> <span class="token punctuation">{</span> icon<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> shade<span class="token punctuation">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
             <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> window<span class="token punctuation">.</span>location<span class="token punctuation">.</span>href <span class="token operator">=</span> <span class="token string">"/qadmin-1.2/article_index.html"</span><span class="token punctuation">;</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
            layer<span class="token punctuation">.</span><span class="token function">msg</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>msg<span class="token punctuation">,</span> <span class="token punctuation">{</span> icon<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span> shade<span class="token punctuation">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span> time<span class="token punctuation">:</span> <span class="token number">2000</span><span class="token punctuation">,</span> shadeClose<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
  <h2>（4）获取文章列表接口</h2> 
  <p>ajax获取之前写的文章列表接口，然后循环dom操作，写到页面上。</p> 
  <pre><code class="prism language-javascript"><span class="token function">$</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    $<span class="token punctuation">.</span><span class="token function">ajax</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
       url<span class="token punctuation">:</span> <span class="token string">'/api/article/list'</span><span class="token punctuation">,</span>
       type<span class="token punctuation">:</span> <span class="token string">'GET'</span><span class="token punctuation">,</span>
       success<span class="token punctuation">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
           <span class="token comment">// console.log(arg.data[0]);</span>
           <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token keyword">in</span> arg<span class="token punctuation">.</span>data<span class="token punctuation">)</span> <span class="token punctuation">{</span>
               <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">".layui-table tbody"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token template-string"><span class="token string">`<tr class="id71">
                   <td>`</span></span><span class="token operator">+</span>arg<span class="token punctuation">.</span>data<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>id<span class="token operator">+</span><span class="token template-string"><span class="token string">`</td>
                   <td><img src="`</span></span><span class="token operator">+</span>arg<span class="token punctuation">.</span>data<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>pic<span class="token operator">+</span><span class="token template-string"><span class="token string">`" height="50px"/></td>
                   <td>17</td>
                   <td>`</span></span><span class="token operator">+</span>arg<span class="token punctuation">.</span>data<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>title<span class="token operator">+</span><span class="token template-string"><span class="token string">`</td>
                   <td>`</span></span><span class="token operator">+</span>arg<span class="token punctuation">.</span>data<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>hits<span class="token operator">+</span><span class="token template-string"><span class="token string">`</td>
                   <td><input data-id="71" lay-filter="state" type="checkbox" checked lay-text="开启|关闭" lay-skin="switch"></td>
                   <td><input data-id="71" lay-filter="top" type="checkbox" checked lay-text="开启|关闭" lay-skin="switch"></td>
                   <td><input data-id="71" lay-filter="experiment" type="checkbox"  lay-text="开启|关闭" lay-skin="switch"></td>
                   <td><input data-id="71" lay-filter="works" type="checkbox"  lay-text="开启|关闭" lay-skin="switch"></td>

                   <td>`</span></span><span class="token operator">+</span><span class="token function">createTime</span><span class="token punctuation">(</span>arg<span class="token punctuation">.</span>data<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>createtime<span class="token punctuation">)</span><span class="token operator">+</span><span class="token template-string"><span class="token string">`</td>
                   <td><a href="/qadmin-1.2/article_updata.html?id=`</span></span><span class="token operator">+</span>arg<span class="token punctuation">.</span>data<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>id<span class="token operator">+</span><span class="token template-string"><span class="token string">`">修改</a> | <a class="del" data-id=".id71"  href="/admin/article/del/id/71.html">删除</a></td>
               </tr>`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
           <span class="token punctuation">}</span>  
       <span class="token punctuation">}</span>
   <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
  <p><img src="http://img.e-com-net.com/image/info8/949f14e8103a437d83df18f341f50c6a.jpg" alt="在这里插入图片描述" width="0" height="0"></p> 
  <p><strong>你们的赞就是对我最大的鼓励。谢谢~</strong></p> 
  <p><img src="http://img.e-com-net.com/image/info8/6fbe53abade74a3380c66fb7050beba7.jpg" alt="在这里插入图片描述" width="0" height="0"></p> 
  <blockquote> 
   <p>微信搜索【web小馆】，回复<strong>全栈博客项目</strong>，即可获取<strong>项目源码和后续的实战文章教程</strong>。每天用最简单朴实的语言，潜移默化的提升你的计算机基础知识和前端技术。小米粥，一个专注的web全栈工程师，我们下期再见！</p> 
  </blockquote> 
  <p><img src="http://img.e-com-net.com/image/info8/5bfceac5c35f40fa82d6717ac7d0087f.png" alt="在这里插入图片描述" width="0" height="0"><br> <img src="http://img.e-com-net.com/image/info8/98bcb7613aa041e480a1c066907d9220.png" alt="node后台" width="0" height="0"></p> 
 </div> 
</div>
                            </div>
                        </div>
                    </div>
                    <!--PC和WAP自适应版-->
                    <div id="SOHUCS" sid="1303875580239843328"></div>
                    <script type="text/javascript" src="/views/front/js/chanyan.js"></script>
                    <!-- 文章页-底部 动态广告位 -->
                    <div class="youdao-fixed-ad" id="detail_ad_bottom"></div>
                </div>
                <div class="col-md-3">
                    <div class="row" id="ad">
                        <!-- 文章页-右侧1 动态广告位 -->
                        <div id="right-1" class="col-lg-12 col-md-12 col-sm-4 col-xs-4 ad">
                            <div class="youdao-fixed-ad" id="detail_ad_1"> </div>
                        </div>
                        <!-- 文章页-右侧2 动态广告位 -->
                        <div id="right-2" class="col-lg-12 col-md-12 col-sm-4 col-xs-4 ad">
                            <div class="youdao-fixed-ad" id="detail_ad_2"></div>
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<a class="tag" taget="_blank" href="/search/error/1.htm">error</a><a class="tag" taget="_blank" href="/search/react/1.htm">react</a><a class="tag" taget="_blank" href="/search/mongodb/1.htm">mongodb</a><a class="tag" taget="_blank" href="/search/%E6%95%B0%E6%8D%AE%E5%BA%93/1.htm">数据库</a>
                        <div>背景每天都能遇到奇怪的问题，做个记录，以便有缘人能得到帮助！换了一台电脑开发nextjs程序。需要连接mongodb数据，对数据进行增删改查。上一台电脑好好的程序，新电脑死活连不上mongodb数据库。同一套代码，没任何修改，搞得我怀疑人生了，打开浏览器进入mongodb官网毫无问题，也能进入线上系统查看数据，网络应该是没问题。于是我尝试了一下手机热点，这次代码能正常跑起来，连接数据库了！！！是不</div>
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                        <span class="text-muted">m0_l5z</span>
<a class="tag" taget="_blank" href="/search/elementui/1.htm">elementui</a><a class="tag" taget="_blank" href="/search/vue.js/1.htm">vue.js</a>
                        <div>一.ElementUI入门目录：1.ElementUI入门1.1ElementUI简介1.2Vue+ElementUI安装1.3开发示例2.搭建nodejs环境2.1nodejs介绍2.2npm是什么2.3nodejs环境搭建2.3.1下载2.3.2解压2.3.3配置环境变量2.3.4配置npm全局模块路径和cache默认安装位置2.3.5修改npm镜像提高下载速度2.3.6验证安装结果3.运行n</div>
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                        <span class="text-muted">2401_85194651</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/maven/1.htm">maven</a>
                        <div>首先就是技术框架：后端：Java+SpringBoot数据库：MySQL前端：Vue.js数据库连接：JPA(JavaPersistenceAPI)1.项目结构blog-app/├──backend/│├──src/main/java/com/example/blogapp/││├──BlogApplication.java││├──config/│││└──DatabaseConfig.java</div>
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                           title="00. 这里整理了最全的爬虫框架（Java + Python）" target="_blank">00. 这里整理了最全的爬虫框架（Java + Python）</a>
                        <span class="text-muted">有一只柴犬</span>
<a class="tag" taget="_blank" href="/search/%E7%88%AC%E8%99%AB%E7%B3%BB%E5%88%97/1.htm">爬虫系列</a><a class="tag" taget="_blank" href="/search/%E7%88%AC%E8%99%AB/1.htm">爬虫</a><a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
                        <div>目录1、前言2、什么是网络爬虫3、常见的爬虫框架3.1、java框架3.1.1、WebMagic3.1.2、Jsoup3.1.3、HttpClient3.1.4、Crawler4j3.1.5、HtmlUnit3.1.6、Selenium3.2、Python框架3.2.1、Scrapy3.2.2、BeautifulSoup+Requests3.2.3、Selenium3.2.4、PyQuery3.2</div>
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                        <span class="text-muted">夜空_2cd3</span>

                        <div>作者：Yrion博客园：cnblogs.com/wyq178/p/11261711.html前言：秒杀系统相信很多人见过，比如京东或者淘宝的秒杀，小米手机的秒杀。那么秒杀系统的后台是如何实现的呢？我们如何设计一个秒杀系统呢？对于秒杀系统应该考虑哪些问题？如何设计出健壮的秒杀系统？本期我们就来探讨一下这个问题：image目录一：****秒杀系统应该考虑的问题二：****秒杀系统的设计和技术方案三：*</div>
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                           title="vue 创建项目报错：command failed: npm install --loglevel error" target="_blank">vue 创建项目报错：command failed: npm install --loglevel error</a>
                        <span class="text-muted">那鱼、会飞</span>
<a class="tag" taget="_blank" href="/search/vue.js/1.htm">vue.js</a><a class="tag" taget="_blank" href="/search/vue-cli3/1.htm">vue-cli3</a>
                        <div>这个问题其实很好解决，只是很多种情况，逐一排除即可。稳下心来~vuecli3创建项目我的node版本是node14.15.0，（永远不要尝试最新版本）node各种版本下载地址：以往的版本|Node.js(nodejs.org)vue/cli@3.12.1npminstall-g@vue/cli@3.12.1（注意vue/cli2和vue/cli3的下载命名有所改变，2是-形式，3是/形式）其实报错</div>
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                           title="更改npm镜像源为淘宝镜像" target="_blank">更改npm镜像源为淘宝镜像</a>
                        <span class="text-muted">骆小骆</span>
<a class="tag" taget="_blank" href="/search/%E5%9F%BA%E4%BA%8Enode.js/1.htm">基于node.js</a>
                        <div>npm常用指令后缀*最近复习了一下node.js整理了一下跟node.js相关的指令后缀*--save、-S参数意思是把模块的版本信息保存到dependencies（生产环境依赖）中，即你的package.json文件的dependencies字段中；–--save-dev、-D参数意思是把模块版本信息保存到devDependencies（开发环境依赖）中，即你的package.json文件的de</div>
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                           title="COCO 格式的数据集转化为 YOLO 格式的数据集" target="_blank">COCO 格式的数据集转化为 YOLO 格式的数据集</a>
                        <span class="text-muted">QYQY77</span>
<a class="tag" taget="_blank" href="/search/YOLO/1.htm">YOLO</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
                        <div>"""--json_path输入的json文件路径--save_path保存的文件夹名字，默认为当前目录下的labels。"""importosimportjsonfromtqdmimporttqdmimportargparseparser=argparse.ArgumentParser()parser.add_argument('--json_path',default='./instances</div>
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                           title="自定义队列" target="_blank">自定义队列</a>
                        <span class="text-muted">junjun2018</span>

                        <div>队列：像排队吃饭一样，先到的先点菜，后来的后点菜。以下代码展示使用单向列表实现的队列。//链表是以节点为单位的，对于单向链表，每个节点中包含一个值和指向下一个对象的引用publicclassNode{Objectvalue;Nodenext;publicNode(Objectvalue){this.value=value;}publicObjectgetValue(){returnvalue;}p</div>
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                           title="切换淘宝最新npm镜像源是" target="_blank">切换淘宝最新npm镜像源是</a>
                        <span class="text-muted">hai40587</span>
<a class="tag" taget="_blank" href="/search/npm/1.htm">npm</a><a class="tag" taget="_blank" href="/search/%E5%89%8D%E7%AB%AF/1.htm">前端</a><a class="tag" taget="_blank" href="/search/node.js/1.htm">node.js</a>
                        <div>切换淘宝最新npm镜像源是一个相对简单的过程，但首先需要明确当前淘宝npm镜像源的状态和最新的镜像地址。由于网络环境和服务更新，镜像源的具体地址可能会发生变化，因此，我将基于当前可获取的信息，提供一个通用的切换步骤，并附上最新的镜像地址（截至回答时）。一、了解npm镜像源npm（NodePackageManager）是JavaScript的包管理器，用于安装、更新和管理项目依赖。由于npm官方仓库</div>
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                           title="NPM私库搭建-verdaccio（Linux）" target="_blank">NPM私库搭建-verdaccio（Linux）</a>
                        <span class="text-muted">Beam007</span>
<a class="tag" taget="_blank" href="/search/npm/1.htm">npm</a><a class="tag" taget="_blank" href="/search/linux/1.htm">linux</a><a class="tag" taget="_blank" href="/search/%E5%89%8D%E7%AB%AF/1.htm">前端</a>
                        <div>1、安装nodelinux服务器安装nodea)、官网下载所需的node版本https://nodejs.org/dist/v14.21.0/b)、解压安装包若下载的是xxx.tar.xz文件，解压命令为tar-xvfxxx.tar.xzc)、修改环境变量修改：/etc/profile文件#SETPATHFORNODEJSexportNODE_HOME=NODEJS解压安装的路径exportPAT</div>
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                                <li><a href="/article/118.htm"
                                       title="异常的核心类Throwable" target="_blank">异常的核心类Throwable</a>
                                    <span class="text-muted">无量</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E6%BA%90%E7%A0%81/1.htm">源码</a><a class="tag" taget="_blank" href="/search/%E5%BC%82%E5%B8%B8%E5%A4%84%E7%90%86/1.htm">异常处理</a><a class="tag" taget="_blank" href="/search/exception/1.htm">exception</a>
                                    <div>java异常的核心是Throwable，其他的如Error和Exception都是继承的这个类 里面有个核心参数是detailMessage，记录异常信息，getMessage核心方法，获取这个参数的值，我们可以自己定义自己的异常类，去继承这个Exception就可以了，方法基本上，用父类的构造方法就OK，所以这么看异常是不是很easy 
 
 
 
package com.natsu;


</div>
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                                <li><a href="/article/245.htm"
                                       title="mongoDB 游标（cursor） 实现分页 迭代" target="_blank">mongoDB 游标（cursor） 实现分页 迭代</a>
                                    <span class="text-muted">开窍的石头</span>
<a class="tag" taget="_blank" href="/search/mongodb/1.htm">mongodb</a>
                                    <div>上篇中我们讲了mongoDB 中的查询函数，现在我们讲mongo中如何做分页查询 
 
     如何声明一个游标 
       var mycursor = db.user.find({_id:{$lte:5}}); 
      迭代显示游标数</div>
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                                       title="MySQL数据库INNODB 表损坏修复处理过程" target="_blank">MySQL数据库INNODB 表损坏修复处理过程</a>
                                    <span class="text-muted">0624chenhong</span>
<a class="tag" taget="_blank" href="/search/tomcat/1.htm">tomcat</a><a class="tag" taget="_blank" href="/search/mysql/1.htm">mysql</a>
                                    <div>最近mysql数据库经常死掉，用命令net stop mysql命令也无法停掉，关闭Tomcat的时候，出现Waiting for N instance(s) to be deallocated 信息。查了下，大概就是程序没有对数据库连接释放，导致Connection泄露了。因为用的是开元集成的平台，内部程序也不可能一下子给改掉的，就验证一下咯。启动Tomcat,用户登录系统，用netstat -</div>
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                                       title="剖析如何与设计人员沟通" target="_blank">剖析如何与设计人员沟通</a>
                                    <span class="text-muted">不懂事的小屁孩</span>
<a class="tag" taget="_blank" href="/search/%E5%B7%A5%E4%BD%9C/1.htm">工作</a>
                                    <div>最近做图烦死了，不停的改图，改图……。烦，倒不是因为改，而是反反复复的改，人都会死。很多需求人员不知该如何与设计人员沟通，不明白如何使设计人员知道他所要的效果，结果只能是沟通变成了扯淡，改图变成了应付。 
 
那应该如何与设计人员沟通呢？ 
 
我认为设计人员与需求人员先天就存在语言障碍。对一个合格的设计人员来说，整天玩的都是点、线、面、配色，哪种构图看起来协调；哪种配色看起来合理心里跟明镜似的，</div>
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                                       title="qq空间刷评论工具" target="_blank">qq空间刷评论工具</a>
                                    <span class="text-muted">换个号韩国红果果</span>
<a class="tag" taget="_blank" href="/search/JavaScript/1.htm">JavaScript</a>
                                    <div>

var a=document.getElementsByClassName('textinput');
					var b=[];
					for(var m=0;m<a.length;m++){
						if(a[m].getAttribute('placeholder')!=null)
							b.push(a[m])
					}
					var l</div>
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                                    <span class="text-muted">灵静志远</span>
<a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a><a class="tag" taget="_blank" href="/search/AOP/1.htm">AOP</a><a class="tag" taget="_blank" href="/search/struts/1.htm">struts</a><a class="tag" taget="_blank" href="/search/session/1.htm">session</a>
                                    <div>错误信息： 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cartService': Scope 'session' is not active for the current thread; consider defining a scoped</div>
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                                       title="xmp标签" target="_blank">xmp标签</a>
                                    <span class="text-muted">a-john</span>
<a class="tag" taget="_blank" href="/search/%E6%A0%87%E7%AD%BE/1.htm">标签</a>
                                    <div>今天在处理数据的显示上遇到一个问题： 
var html = '<li><div class="pl-nr"><span class="user-name">' + user
           + '</span>' + text + '</div></li>';
ulComme</div>
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                                       title="Ajax的常用技巧（2）---实现Web页面中的级联菜单" target="_blank">Ajax的常用技巧（2）---实现Web页面中的级联菜单</a>
                                    <span class="text-muted">aijuans</span>
<a class="tag" taget="_blank" href="/search/Ajax/1.htm">Ajax</a>
                                    <div>在网络上显示数据，往往只显示数据中的一部分信息，如文章标题，产品名称等。如果浏览器要查看所有信息，只需点击相关链接即可。在web技术中，可以采用级联菜单完成上述操作。根据用户的选择，动态展开，并显示出对应选项子菜单的内容。 在传统的web实现方式中，一般是在页面初始化时动态获取到服务端数据库中对应的所有子菜单中的信息，放置到页面中对应的位置，然后再结合CSS层叠样式表动态控制对应子菜单的显示或者隐</div>
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                                       title="天-安-门，好高" target="_blank">天-安-门，好高</a>
                                    <span class="text-muted">atongyeye</span>
<a class="tag" taget="_blank" href="/search/%E6%83%85%E6%84%9F/1.htm">情感</a>
                                    <div>    我是85后，北漂一族，之前房租1100，因为租房合同到期，再续，房租就要涨150。最近网上新闻，地铁也要涨价。算了一下，涨价之后，每次坐地铁由原来2块变成6块。仅坐地铁费用，一个月就要涨200。内心苦痛。 
 
    晚上躺在床上一个人想了很久，很久。 
   
    我生在农</div>
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                                       title="android 动画" target="_blank">android 动画</a>
                                    <span class="text-muted">百合不是茶</span>
<a class="tag" taget="_blank" href="/search/android/1.htm">android</a><a class="tag" taget="_blank" href="/search/%E9%80%8F%E6%98%8E%E5%BA%A6/1.htm">透明度</a><a class="tag" taget="_blank" href="/search/%E5%B9%B3%E7%A7%BB/1.htm">平移</a><a class="tag" taget="_blank" href="/search/%E7%BC%A9%E6%94%BE/1.htm">缩放</a><a class="tag" taget="_blank" href="/search/%E6%97%8B%E8%BD%AC/1.htm">旋转</a>
                                    <div>android的动画有两种  tween动画和Frame动画 
  
tween动画;,透明度,缩放,旋转,平移效果 
  
Animation   动画 
AlphaAnimation 渐变透明度 
RotateAnimation 画面旋转 
ScaleAnimation 渐变尺寸缩放 
TranslateAnimation 位置移动 
Animation</div>
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                                       title="查看本机网络信息的cmd脚本" target="_blank">查看本机网络信息的cmd脚本</a>
                                    <span class="text-muted">bijian1013</span>
<a class="tag" taget="_blank" href="/search/cmd/1.htm">cmd</a>
                                    <div>@echo 您的用户名是：%USERDOMAIN%\%username%>"%userprofile%\网络参数.txt"
@echo 您的机器名是：%COMPUTERNAME%>>"%userprofile%\网络参数.txt"
@echo ___________________>>"%userprofile%\</div>
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                                    <span class="text-muted">征客丶</span>
<a class="tag" taget="_blank" href="/search/plsql/1.htm">plsql</a>
                                    <div>tools---preferences----logon history---history  把你想要删除的删除 
 
 
-------------------------------------------------------------------- 
若有其他凝问或文中有错误，请及时向我指出， 
我好及时改正，同时也让我们一起进步。 
email ： binary_spac</div>
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                                    <span class="text-muted">bit1129</span>
<a class="tag" taget="_blank" href="/search/pig/1.htm">pig</a>
                                    <div>Pig安装 
1.下载pig 
  
wget http://mirror.bit.edu.cn/apache/pig/pig-0.14.0/pig-0.14.0.tar.gz 
  
2. 解压配置环境变量 
  
   如果Pig使用Map/Reduce模式，那么需要在环境变量中，配置HADOOP_HOME环境变量 
  
expor</div>
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                                       title="Java 线程同步几种方式" target="_blank">Java 线程同步几种方式</a>
                                    <span class="text-muted">BlueSkator</span>
<a class="tag" taget="_blank" href="/search/volatile/1.htm">volatile</a><a class="tag" taget="_blank" href="/search/synchronized/1.htm">synchronized</a><a class="tag" taget="_blank" href="/search/ThredLocal/1.htm">ThredLocal</a><a class="tag" taget="_blank" href="/search/ReenTranLock/1.htm">ReenTranLock</a><a class="tag" taget="_blank" href="/search/Concurrent/1.htm">Concurrent</a>
                                    <div>为何要使用同步？       java允许多线程并发控制，当多个线程同时操作一个可共享的资源变量时（如数据的增删改查），        将会导致数据不准确，相互之间产生冲突，因此加入同步锁以避免在该线程没有完成操作之前，被其他线程的调用，        从而保证了该变量的唯一性和准确性。    1.同步方法&</div>
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                                       title="StringUtils判断字符串是否为空的方法（转帖）" target="_blank">StringUtils判断字符串是否为空的方法（转帖）</a>
                                    <span class="text-muted">BreakingBad</span>
<a class="tag" taget="_blank" href="/search/null/1.htm">null</a><a class="tag" taget="_blank" href="/search/StringUtils/1.htm">StringUtils</a><a class="tag" taget="_blank" href="/search/%E2%80%9C%E2%80%9D/1.htm">“”</a>
                                    <div>转帖地址：http://www.cnblogs.com/shangxiaofei/p/4313111.html 
  
public static boolean isEmpty(String str)      
　　判断某字符串是否为空，为空的标准是 str== 
null  
或 str.length()== 
0    </div>
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                                    <div>

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class LevelTraverseBinaryTree {

    /**
     * 编程之美 分层遍历二叉树
     * 之前已经用队列实现过二叉树的层次遍历，但这次要求输出换行，因此要</div>
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// 取值
	// alert($("input[name='username']").val());
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                                    <div>这个开源软件包是国内的一位高手自行研制开发的，正如他所说的一样，我觉得它可以使一个工作流引擎上一个台阶。。。。。。欢迎大家使用，并提出意见和建议。。。 
----------转帖--------------------------------------------------- 
 IK Expression是一个开源的（OpenSource），可扩展的（Extensible），基于java语言</div>
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<a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a>
                                    <div>1、PropertyPlaceholderConfigurer 
Spring中PropertyPlaceholderConfigurer这个类，它是用来解析Java Properties属性文件值，并提供在spring配置期间替换使用属性值。接下来让我们逐渐的深入其配置。 
 
基本的使用方法是：(1) 
 
<bean id="propertyConfigurerForWZ&q</div>
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tree代码: 
 
</div>
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                                    <div>C语言字符串函数大全 
  
  
函数名: stpcpy 
功 能: 拷贝一个字符串到另一个 
用 法: char *stpcpy(char *destin, char *source); 
程序例: 
  
#include <stdio.h> 
#include <string.h> 
  
int main</div>
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-(void)viewWillAppear:(BOOL)animated
{
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                                    <div>window下在同一台机器上安装多个版本jdk，修改环境变量不生效问题处理办法 
 
本机已经安装了jdk1.7，而比较早期的项目需要依赖jdk1.6，于是同时在本机安装了jdk1.6和jdk1.7. 
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java version "1.7.0_21&quo</div>
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<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E5%88%9B%E5%BB%BA/1.htm">创建</a><a class="tag" taget="_blank" href="/search/%E5%AD%90%E7%B1%BB%E5%AF%B9%E8%B1%A1/1.htm">子类对象</a><a class="tag" taget="_blank" href="/search/%E7%88%B6%E7%B1%BB%E5%AF%B9%E8%B1%A1/1.htm">父类对象</a>
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                                    <span class="text-muted">jinnianshilongnian</span>
<a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a>
                                    <div>  
  一、《跟我学spring3》电子书下载地址： 
《跟我学spring3》  （1-7 和 8-13） http://jinnianshilongnian.iteye.com/blog/pdf   
  
跟我学spring3系列 word原版 下载 
  
  二、
源代码下载  
最新依</div>
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                                    <div>index.html 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/</div>
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                                    <div>http://www.sap.com/corporate-en/press.epx?PressID=14787 
  
有机会研究下EIM家族的两个新产品~~~~ 
  
New features of the 4.0 releases of BI and EIM solutions include:  
 
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<a class="tag" taget="_blank" href="/search/java/1.htm">java</a>
                                    <div>长期以来，多线程问题颇为受到面试官的青睐。虽然我个人认为我们当中很少有人能真正获得机会开发复杂的多线程应用(在过去的七年中，我得到了一个机会)，但是理解多线程对增加你的信心很有用。之前，我讨论了一个wait()和sleep()方法区别的问题，这一次，我将会讨论join()和yield()方法的区别。坦白的说，实际上我并没有用过其中任何一个方法，所以，如果你感觉有不恰当的地方，请提出讨论。 
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                                    <span class="text-muted">阿尔萨斯</span>
<a class="tag" taget="_blank" href="/search/Manifest/1.htm">Manifest</a>
                                    <div>结构 
继承关系 
public final class Manifest extends Objectjava.lang.Objectandroid.Manifest 
内部类 
 
 
 class Manifest.permission权限 
 class Manifest.permission_group权限组 
 构造函数 
 
public Manifest () 详细  androi</div>
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<a class="tag" taget="_blank" href="/search/oracle/1.htm">oracle</a>
                                    <div>关键字：Oracle实现类split函数的方 
项目里需要保存结构数据，批量传到后他进行保存，为了减小数据量，子集拼装的格式，使用存储过程进行保存。保存的过程中需要对数据解析。但是oracle没有Java中split类似的函数。从网上找了一个，也补全了一下。 
 
CREATE OR REPLACE TYPE t_split_100 IS TABLE OF VARCHAR2(100); 
 
cr</div>
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