关于css:三列布局圣杯与双飞翼

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<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    \* {
      padding: 0;
      margin: 0;
    }

    .container {
      padding-left: 200px;
      padding-right: 200px;
    }

    .left {
      float: left;
      width: 200px;
      height: 400px;
      background: red;
      margin-left: -100%;
      position: relative;
      left: -200px;
    }

    .center {
      float: left;
      width: 100%;
      height: 400px;
      background: yellow;
    }

    .right {
      float: left;
      width: 200px;
      height: 400px;
      background: blue;
      margin-left: -200px;
      position: relative;
      right: -200px;
    }
</style>
</head>
<body>
<section class="container">
  <div class="center"></div>
  <div class="left"></div>
  <div class="right"></div>
</section>
</body>
</html>

步骤

先写 center 局部，width 100%
center,left,right都是左浮动
父容器 container 设置 padding-left 和padding-right
设置 margin-left 为负值让 left 和right局部回到与 center 局部同一行
设置绝对定位，让 left 和right局部挪动到两边

center 局部的最小宽度不能小于 left 局部的宽度
其中一列内容高度拉长，其余两列的高度不会主动填充

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    \*{
      padding: 0;
      margin: 0;
    }
    .container {min-width: 600px;}
    .left {
      float: left;
      width: 200px;
      height: 400px;
      background: red;
      margin-left: -100%;
    }
    .center {
      float: left;
      width: 100%;
      height: 400px;
      background: yellow;
    }
    .center .inner {margin: 0 200px;}
    .right {
      float: left;
      width: 200px;
      height: 400px;
      background: blue;
      margin-left: -200px;
    }
</style>
</head>
<body>
<section class="container">
  <div class="center">
    <div class="inner"> 双飞翼布局 </div>
  </div>
  <div class="left"></div>
  <div class="right"></div>
</section>
</body>
</html>