css 布局 

<style>
    /* 圣杯布局 */
    /**
     * 1.先写大盒子100%宽 在写固定宽度的盒子
     * 2.三个盒子都浮动
     * 3.父元素写padding
     * 4.固定元素写定位relative 
     */
    .box>div{
      float: left;
      height: 200px;
    }
    .box{
      padding: 0 100px;
    }
    .main{
      width: 100%;
      background: #f00;
    }
    .left{
      width: 100px;
      background: #0f0;
      margin-left: -100%;
      position: relative;
      left: -100px;
    }
    .right{
      width: 100px;
      background: #00f;
      margin-left: -100px;
      position: relative;
      right: -100px;
    }
    /* 双飞翼布局 */
    .box>div{
      float: left;
      height: 200px;
    }
    .main{
      width: 100%;
      background: #f00;
    }
    .main .center{
      margin: 0 100px;
      width: 100%;
      height: 100%;
      background: black;
      color: #fff;
    }
    .left{
      width: 100px;
      background: #0f0;
      margin-left: -100%;
    }
    .right{
      width: 100px;
      background: #00f;
      margin-left: -100px;
    }
  </style>

结构

  <!-- 圣杯布局 -->
  <div class="box">
    <div class="main"></div>
    <div class="left">111111</div>
    <div class="right">11111</div>
  </div>
  <!-- （淘宝）双飞翼布局 -->
  <div class="box">
    <div class="main">
      <div class="center">111111</div>
    </div>
    <div class="left">111111</div>
    <div class="right">11111</div>
  </div>