五种方式实现三栏布局（两边固定宽度，中间自适应）

July 11, 2018
三栏布局是网页中常见的布局，即两边固定宽度，中间自适应，下面我们用五种不同的方式来实现这种布局。
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    html * {
      margin: 0;
      padding: 0;
    }

    .layout {
      margin-top: 20px;
    }

    .layout:first-child {
      margin-top: 0;
    }

    .layout div {
      min-height: 150px;
    }
  </style>
</head>
<body>
  <!-- float 浮动解决方案 -->
  <section class="layout float">
    <style>
      .layout.float .left {
        float: left;
        width: 300px;
        background: red;
      }
      .layout.float .right {
        float: right;
        width: 300px;
        background: blue;
      }
      .layout.float .center {
        background: yellow;
      }
    </style>
    <div class="left"></div>
    <div class="right"></div>
    <div class="center">
      <h1>浮动解决方案</h1>
      <p>这是三栏布局的中间部分</p>
    </div>
  </section>

  <!-- 绝对定位 -->
  <section class="layout absolute">
    <style>
      .layout.absolute > div {
        position: absolute;
      }
      .layout.absolute .left {
        left: 0;
        width: 300px;
        background: red;
      }
      .layout.absolute .center {
        left: 300px;
        right: 300px;
        background: yellow;
      }
      .layout.absolute .right {
        right: 0;
        width: 300px;
        background: blue;
      }
    </style>
    <div class="left"></div>
    <div class="center">
      <h1>绝对定位解决方案</h1>
      <p>这是三栏布局绝对定位的中间部分</p>
    </div>
    <div class="right"></div>
  </section>

  <!-- Flexbox 布局 -->
  <section class="layout flexbox">
    <style>
      .layout.flexbox {
        display: flex;
        margin-top: 190px;
      }
      .layout.flexbox .left {
        width: 300px;
        background: red;
      }
      .layout.flexbox .center {
        flex: 1;
        background: yellow;
      }
      .layout.flexbox .right {
        width: 300px;
        background: blue;
      }
    </style>
    <div class="left"></div>
    <div class="center">
      <h2>Flexbox 解决方案</h2>
      <p>这是三栏布局Flexbox 的中间部分</p>
    </div>
    <div class="right"></div>
  </section>

  <!-- table 布局 -->
  <section class="layout table">
    <style>
      .layout.table {
        width: 100%;
        display: table;
        height: 150px;
      }
      .layout.table > div {
        display: table-cell;
      }
      .layout.table .left {
        width: 300px;
        background: red;
      }
      .layout.table .center {
        background: yellow;
      }
      .layout.table .right {
        width: 300px;
        background: blue;
      }
    </style>
    <div class="left"></div>
    <div class="center">
      <h2>表格布局</h2>
      <p>这是三栏布局表格布局的中间部分</p>
    </div>
    <div class="right"></div>
  </section>

  <!-- 网格布局 -->
  <section class="layout grid">
    <style>
      .layout.grid {
        display: grid;
        width: 100%;
        grid-template-row: 150px;
        grid-template-columns: 300px auto 300px;
      }
      .layout.grid .left {
        background: red;
      }
      .layout.grid .center {
        background: yellow;
      }
      .layout.grid .right {
        background: blue;
      }
    </style>
    <div class="left"></div>
    <div class="center">
      <h1>网格布局解决方案</h1>
      <p>这是三栏布局网格布局的中间部分</p>
    </div>
    <div class="right"></div>
  </section>
</body>
</html>