Xu•thus Blog

CSS布局之三栏布局

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三栏布局是一种使用非常广泛的布局方式，一般是左右固定宽度，中间内容自适应

这里收集了三栏布局的五种方法

浮动布局

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<!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>
       .left {
           width: 200px;
           background: red;
           float: left;
           height: 100px;  
       }
       .right {
           width: 200px;
           background: yellow;
           float: right;
           height: 100px;  
       }
       .center {
           background: blue;
           height: 100px; 
       }
    </style>
</head>
<body>
    <div class="box">
        <div class="left"></div>
        <div class="right"></div>
        <div class="center"></div>
    </div>
</body>
</html>

优点：兼容性好，易上手
缺点：浮动会脱离文档流，需要清除浮动

绝对定位

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<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        .box > div {
            position: absolute;
            height: 100px; 
       } 
       .left {
           width: 200px;
           left: 0;
           background: red;
       }
       .right {
           width: 200px;
           right: 0;
           background: yellow;
       }
       .center {
           left: 200px;
           right: 200px;
           background: blue;
       }
    </style>
</head>
<body>
    <div class="box">
        <div class="left"></div>
        <div class="center"></div>
        <div class="right"></div>
    </div>
</body>

优点：简单，快速
缺点：会脱离文档流

flexbox布局

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<!DOCTYPE html>
<html lang="en">
<head>
    <style>
       .box {
           display: flex;
           width: 100%; 
       }
        .box > div {
            height: 100px; 
        } 
       .left {
           width: 200px;
           background: red;
       }
       .right {
           width: 200px;
           background: yellow;
       }
       .center {
           flex: 1;
           background: blue;
       }
    </style>
</head>
<body>
    <div class="box">
        <div class="left"></div>
        <div class="center"></div>
        <div class="right"></div>
    </div>
</body>
</html>

优点：快速，未来趋势

表格布局

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<!DOCTYPE html>
<html lang="en">
<head>
    <style>
       .box {
           width: 100%;
           display: table;
       }
        .box > div {
            height: 100px; 
            display: table-cell;
        } 
       .left {
           width: 200px;
           background: red;
       }
       .right {
           width: 200px;
           background: yellow;
       }
       .center {
           background: blue;
       }
    </style>
</head>
<body>
    <div class="box">
        <div class="left"></div>
        <div class="center"></div>
        <div class="right"></div>
    </div>
</body>
</html>

优点：兼容性好
缺点：对复杂页面来说，操作繁琐，seo不友好

网格布局

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<!DOCTYPE html>
<html lang="en">
<head>
    <style>
       .box {
          width: 100%;
          display: grid;
          grid-template-rows: 100px;
          grid-template-columns: 200px auto 200px;
       }
       .left {
           background: red;
       }
       .right {
           background: yellow;
       }
       .center {
           background: blue;
       }
    </style>
</head>
<body>
    <div class="box">
        <div class="left"></div>
        <div class="center"></div>
        <div class="right"></div>
    </div>
</body>
</html>

优点：新技术，快速
缺点：兼容性问题