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flex PC端布局
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  1.    <style>
  2.       *,
  3.       ::before,
  4.       ::after {
  5.         margin: 0px; /*清除外边距*/
  6.         padding: 0px; /*清除内边距*/
  8.         box-sizing: border-box; /*将盒子换为IE盒子 边框和内边距将不占据盒子大小*/
  9.       }
  11.       .box {
  12.         display: flex; /*将最大的容器转换弹性盒子*/
  13.         flex-flow: column nowrap; /*主轴为垂直排列 不换行*/
  14.         background-color: #f3f5f7; /*背景颜色*/
  15.       }
  16.       /*导航*/
  17.       header {
  18.         background-color: #000; /*导航背景颜色*/
  19.         height: 3em; /*高度*/
  20.         display: flex; /*将导航父容器转换为弹性盒子*/
  21.         flex-flow: row; /*主轴方向横向排列 */
  23.         align-items: center; /*交叉轴垂直居中*/
  24.       }
  26.       header > a {
  27.         text-decoration: none; /*去掉a标签的下划线*/
  28.         color: rgba(255, 255, 255, 0.7); /*字体颜色*/
  29.         flex: 1; /*项目自动分配宽度*/
  30.         text-align: center; /*文本居中*/
  31.       }
  32.       /*主体*/
  34.       .box > .container {
  35.         margin-top: 2em; /*主体盒子上外边距*/
  36.         display: flex; /*将主体转换弹性盒子*/
  37.         border: 1px solid; /*边框线*/
  39.         min-height: 40em; /*最小高度*/
  41.         justify-content: center; /*主轴对齐方式*/
  42.       }
  43.       .container div {
  44.         border: 1px solid;
  45.       }
  46.       .container div:first-of-type {
  47.         flex: 0 0 20%;
  48.       } /*主体内容里面的第一个项目占20%*/
  49.       .container div:nth-of-type(2) {
  50.         flex: 0 0 40%;
  51.       } /*主体内容里面的第二个项目占40%*/
  52.       .container div:last-of-type {
  53.         flex: 0 0 20%;
  54.       } /*主体内容里面的最后一个项目占20%*/
  56.       /*底部*/
  57.       footer {
  58.         margin-top: 1em; /*底部盒子上外边距*/
  59.         display: flex; /*将容器转换为弹性盒子*/
  60.         flex-flow: column nowrap; /*主轴横向对齐 不换行*/
  61.         text-align: center; /*文本居中对齐*/
  62.         border: 1px solid; /*边框线*/
  63.         background-color: #fff; /*背景颜色*/
  64.       }
  65.       @media screen and (max-width: 900px) {
  66.         .container div:last-of-type {
  67.           display: none;
  68.         } /*当宽度小于900px时  主体内容里的right不显示*/
  69.       }
  70.       @media screen and (max-width: 700px) {
  71.         header > a:not(:nth-of-type(-n + 5)) {
  72.           display: none;
  73.         } /*当宽度小于700px时 只显示前5个导航*/
  74.       }
  75.     </style>
  77.   <body>
  78.     <div class="box">
  79.       <!--导航-->
  80.       <header>
  81.         <a href="#">LOGO</a>
  82.         <a href="#">首页</a>
  83.         <a href="#">视频教程</a>
  84.         <a href="#">入门教程</a>
  85.         <a href="#">社区问答</a>
  86.         <a href="#">技术文章</a>
  87.         <a href="#">资源下载</a>
  88.         <a href="#">编程词典</a>
  89.         <a href="#">工具下载</a>
  90.         <a href="#">PHP培训</a>
  91.       </header>
  92.       <!--主体-->
  93.       <div class="container">
  94.         <div class="left"><h1>头条</h1></div>
  95.         <div class="middle"><h1>最新课程</h1></div>
  96.         <div class="right"><h1>常用手册</h1></div>
  97.       </div>
  98.       <!--底部-->
  99.       <footer>
  100.         <p>php中文网：公益在线php培训，帮助PHP学习者快速成长！</p>
  101.         <p>
  102.           Copyright 2014-2020 https://www.php.cn/ All Rights Reserved |
  103.           苏州跃动光标网络科技有限公司 | 苏ICP备2020058653号-1
  104.         </p>
  105.       </footer>
  106.     </div>
  107.   </body>

效果:

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：是不是有一种相见恨晚的起脚
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