Koa2学习系列07-处理静态资源——指定静态文件目录,设定缓存

处理静态资源

无非花开花落,静静。

 

指定静态资源目录

这里我们使用第三方中间件: koa-static

 

安装并使用

安装 koa-static

npm i koa-static -S

 

修改 app.js,增加并指定 /public 目录为静态资源目录。

  const Koa = require('koa')
  const path = require('path')
  const bodyParser = require('koa-bodyparser')
  const nunjucks = require('koa-nunjucks-2')
  // 引入 koa-static
  const staticFiles = require('koa-static')

  const app = new Koa()
  const router = require('./router')

  // 指定 public目录为静态资源目录,用来存放 js css images 等
  app.use(staticFiles(path.resolve(__dirname, "./public")))

  app.use(nunjucks({
    ext: 'html',
    path: path.join(__dirname, 'views'),
    nunjucksConfig: {
      trimBlocks: true
    }
  }));

  app.use(bodyParser())
  router(app)
  app.listen(3000, () => {
    console.log('server is running at http://localhost:3000')
  })

 

之后我们对项目的视图进行美化,使之更为赏心悦目。

 

增加样式文件

 

在 /public/home/ 目录下新增样式文件 main.css,内容如下:

  *{
    padding: 0;
    margin: 0;
  }

  body,html{
    font-size: 14px;
    color: #000;
    background: #fff;
    font-family: Helvetica Neue,Helvetica,Segoe UI,Arial,Hiragino Sans GB,Microsoft YaHei;
    -webkit-font-smoothing: antialiased;
    position: relative;
  }
  .fn-clear:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0
  }

  .fn-clear {
    zoom:1}
  a {
    color: #0366d6;
    text-decoration: none; 
  }

  a:hover {
    text-decoration: none; 
  }

  .header{
    width: 100%;
    background-color: #474747;
  }

  .header-box{
    height: 30px;
    line-height: 30px;
    font-size: 12px;
    letter-spacing: 2px;
    color: #d5d5d5;
    transition: color .3s;
  }

  .header-box>.logo{
    letter-spacing: 0;
    font-size: 12px;
  }

  .wraper{
    width: 1200px;
    margin: 0 auto;
  }

  .container{
    min-height: 500px;
    padding: 80px 0;
  }

  .footer{
    background: #262a30;
    padding: 50px 0;
    border-top: 1px solid #ddd;
    color: #999;
    font-size: 16px;
  }
  .footer-box{
    width: 800px;
    margin: 0 auto;
    text-align: center;
  }
  .banner_box{
    width: 100%;
    min-width: 1200px;
    height: 438px;
    background: url(https://res.hjfile.cn/cc/cctalk.hujiang.com/home/images/banner-2QEtv.jpg?2QEtv) 50% no-repeat;
    background-size: cover;
  }
  .banner_box>.banner_inner{
    width: 1200px;
    margin: 0 auto;
    padding-top: 112px;
  }
  .banner_inner>.slogan{
    width: 427px;
    height: 54px;
    background: url(https://res.hjfile.cn/cc/cctalk.hujiang.com/home/images/[email protected]?3x9xM);
    background-size: 100% auto;
    margin: 0 auto 25px;
    text-indent: -99999rem;
  }
  .banner_inner>.des{
    margin-bottom: 24px;
    font-size: 16px;
    line-height: 1.9;
    color: #fff;
    text-align: center;
  }
  .banner_inner>.btn{
    display: block;
    margin: 0 auto;
    width: 220px;
    height: 48px;
    font-size: 20px;
    line-height: 48px;
    border-radius: 4px;
    background-color: #15a9ff;
    color: #fff;
    text-align: center;
    text-decoration: none;
    box-shadow: 0 2px 6px rgba(0,0,0,.3);
  }

  .show_time>.feature-con{
    background: #fff;
    border-bottom: 2px solid #f8f8f8;
    min-width: 1200px;
  }
  .feature-con>.feature{
    list-style: none;
    margin: 0 auto;
    padding: 40px 0 60px;
    width: 1200px;
  }
  .feature>.feature-item{
    float: left;
    width: 160px;
    margin: 0;
    padding: 0;
    margin-right: 132px;
  }
  .feature>.feature-item:first-child{
    margin-left: 88px;
  }
  .feature>.feature-item:last-child{
    margin-right: 0;
  }
  .feature .ico{
    display: inline-block;
    width: 160px;
    height: 130px;
    background: url(https://res.hjfile.cn/cc/cctalk.hujiang.com/home/images/[email protected]?BvNad);
    background-size: 100% auto;
  }
  .feature>.feature-item:nth-child(2) .ico{
    background-image: url(https://res.hjfile.cn/cc/cctalk.hujiang.com/home/images/[email protected]);
  }
  .feature>.feature-item:nth-child(3) .ico{
    background-image: url(https://res.hjfile.cn/cc/cctalk.hujiang.com/home/images/[email protected]);
  }
  .feature>.feature-item:nth-child(4) .ico{
    background-image: url(https://res.hjfile.cn/cc/cctalk.hujiang.com/home/images/[email protected]);
  }
  .feature-item>.tit{
    padding: 0;
    margin: 0;
    font-size: 16px;
    line-height: 26px;
    color: #333;
    text-align: center;
    font-weight: 400;
  }
  .feature-item>.des{
    padding: 0;
    margin: 0;
    font-size: 16px;
    line-height: 26px;
    color: #333;
    text-align: center;
    opacity: .5;
  }

  .hp-overlay{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    opacity: .5;
    filter: Alpha(opacity=50);
    background-color: #000;
  }

  .hp-dialog{
    width: 370px;
    border-radius: 5px;
    background-color: #fff;
    outline: 0;
    box-shadow: 0 5px 30px rgba(0,0,0,.2);
    z-index: 1000000;
    position: fixed;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%,-50%);  
    -ms-transform: translate(-50%,-50%);  
    transform: translate(-50%,-50%); 
  }

  .hp-box{
    padding: 12px 30px 30px;
    color: #333;
  }
  .hp-box h1{
    line-height: 48px;
    text-align: center;
    font-size: 20px;
    font-weight: 400;
    margin-bottom: 12px;
  }
  .hp-box .error{
    color: red;
    line-height: 30px;
  }
  .hp-box input{
    display: block;
    width: 100%;
    height: 42px;
    padding: 10px 10px 10px 10px;
    border-radius: 3px;
    border: 1px solid #e5e5e5;
    font-size: 14px;
    line-height: 20px;
    outline: 0;
    -webkit-appearance: none;
    appearance: none;
    -webkit-transition: border .2s ease;
    transition: border .2s ease;
    margin-bottom: 30px;
    box-sizing: border-box;
  }
  .hp-box button{
    display: block;
    width: 100%;
    height: 42px;
    background-color:#44b336;
    border: 0;
    border-radius: 3px;
    color: #fff;
    font-size: 18px;
    line-height: 42px;
    text-align: center;
    outline: 0;
    cursor: pointer;
  }
  .hp-box input:focus,.hp-box input:focus:hover {
    border: 1px solid #44b336
  }

  .hp-box input:hover {
    border: 1px solid #ddd
  }

  .hp-box input::-webkit-input-placeholder {
    color: #ddd
  }

  .hp-box input::-ms-input-placeholder {
    color: #ddd
  }

  .hp-box input::-ms-reveal {
    display: none
  }

  .hp-box input::-ms-clear {
    display: none
  }
  .footer .title{
    font-size: 24px;
  }
  .footer .info{
    letter-spacing: 2px;
  }

 

然后修改 views 视图文件,按照继承的方式提取出公用部分。

 

增加公用视图

新建 /views/common/header.html

  
Node实战教程 |

 

新建 /views/common/footer.html

  

 

新建 /views/common/layout.html。注意,此处有模板变量 title 。

  
  
  
      {{title}} 
      
      {% block head %} {% endblock %}
  
  
      {% include "./header.html" %}

      {% block body %}
      {% endblock %}
      
      {% include "./footer.html" %}


      {% block content %}
      {% endblock %}
  

  

 

layout.html 就是我们的基础页面。现在我们再为 home 创建专用的 layout-home.html,并在里面引用之前创建的样式表:

 

新建 /views/common/layout-home.html。注意,我们在 body 模块里又增加了一个 homeBanner 模块:

{% extends "./layout.html" %} 

{% block head %}

{% endblock %}

{% block body %}

  {% block homeBanner %}
  {% endblock %}

  • 免费资源

    为天地立心

  • 体系知识

    为科技立命

  • 实战项目

    为大牛继绝学

  • 线下交流

    为教育开太平

{% endblock %}

 

公用部分提取完成之后,重写 home 交互页面。此时我们对登录功能的视图进行美化,有主页,登录,以及登录后的响应页面。

 

重写 home 业务的视图

 

新增 /views/home/index.html 首页

{% extends "common/layout-home.html" %} 
{% block homeBanner %}

{% endblock %}

 

修改 /views/home/login.html 登录页面

  {% extends "common/layout-home.html" %} 
  {% block homeBanner %}
  
  {% endblock %}
  {% block content %}
  

到达战场

{{content}}

{% endblock %}

 

新增 /views/home/success.html 成功页面

{% extends "common/layout-home.html" %} 
{% block homeBanner %}

{% endblock %}

 

增加完成后,需要对 home 的处理逻辑进行修改

 

重写 home 处理逻辑

 

修改 /service/home.js

  module.exports = {
    register: async function(name, pwd) {
      let data 
      if(name == 'ikcamp' && pwd == '123456'){
        data = {
          status: 0,
          data: {
            title: "个人中心",
            content: "欢迎进入个人中心"
          }
        }
      }else{
        data = {
          status: -1,
          data: {
            title: '登录失败',
            content: "请输入正确的账号信息"
          }
        }
      }
      return data
    }
  }

修改 /controller/home.js 中的 index 和 register 方法:

  const HomeService = require("../service/home")
  module.exports = {
    // 修改 index 方法
    index: async function (ctx, next) {
      await ctx.render("home/index", {title: "iKcamp欢迎您"})
    },
    // 修改 register 方法
    register: async function (ctx, next){
      let params = ctx.request.body
      let name = params.name
      let password = params.password
      let res = await HomeService.register(name,password)
      if(res.status == "-1"){
        await ctx.render("home/login", res.data)
      }else{
        ctx.state.title = "个人中心"
        await ctx.render("home/success", res.data)
      }
    }
  }

 

运行代码,并通过浏览器访问 localhost:3000:

 

点击进入战场

 

验证失败

 

验证成功

 

目前,项目的基本功能都已完善。结构目录如下:

  ├── controller/
  │     ├── home.js
  ├── service/
  │     ├── home.js
  ├── views/
  │     ├── common/ 
  │         ├── header.html
  │         ├── footer.html
  │         ├── layout.html
  │         ├── layout-home.html
  │     ├── home/ 
  │         ├── index.html
  │         ├── login.html
  │         ├── success.html
  ├── public/ 
  │     ├── home/ 
  │         ├── main.css
  ├── app.js
  ├── router.js
  ├── package.json

 

在后面的章节中,我们将进一步完善其他功能,例如 JSON 数据传递,错误处理机制,日志记录功能等。

原文https://github.com/ikcamp/koa2-tutorial/tree/6-static

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