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高度已知，左右定宽，中间自适应三栏布局的五种写法

1.使用浮动布局

<!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>

        *{
            margin: 0;
            padding: 0;
        }

        .box>div{
            height: 100px;
        }

        .box .left{
            background-color: red;
             300px;
            float: left;
        }

        .box .right{
            background-color: blue;
             300px;
            float: right;
        }

        .box .center{
            text-align: center;
            line-height: 100px;
            color: #fff;
            background-color: orange;
        }
    </style>
</head>
<body>
    
    <div class="box">
        <div class="left"></div>
        <div class="right"></div>
        <div class="center">第一种方法：浮动</div>
    </div>

</body>
</html>

2.使用定位布局

<!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>

        *{
            margin: 0;
            padding: 0;
        }

        .box>div{
            height: 100px;
            position: absolute;
        }

        .box .left{
            background-color: red;
             300px;
            left: 0;
        }

        .box .right{
            background-color: blue;
             300px;
            right: 0;
        }

        .box .center{
            text-align: center;
            line-height: 100px;
            color: #fff;
            background-color: orange;
            left: 300px;
            right: 300px;
        }
    </style>
</head>
<body>
    
    <div class="box">
        <div class="left"></div>
        <div class="center">第二种方法：定位</div>
        <div class="right"></div>
    </div>

</body>
</html>

3.使用flex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>

        *{
            margin: 0;
            padding: 0;
        }

        .box{
            display: flex;
        }

        .box>div{
            height: 100px;
        }

        .box .left{
            background-color: red;
             300px;
        }

        .box .right{
            background-color: blue;
             300px;
        }

        .box .center{
            text-align: center;
            line-height: 100px;
            color: #fff;
            background-color: orange;
            
            flex: 1;
        }
    </style>
</head>
<body>
    
    <div class="box">
        <div class="left"></div>
        <div class="center">第三种方法：flexbox布局</div>
        <div class="right"></div>
    </div>

</body>
</html>

4.使用表格布局

<!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>

        *{
            margin: 0;
            padding: 0;
        }

        .box{
            display: table;
             100%;
            height: 100px;
        }

        .box>div{
            display: table-cell;
        }

        .box .left{
            background-color: red;
             300px;
        }

        .box .right{
            background-color: blue;
             300px;
        }

        .box .center{
            text-align: center;
            line-height: 100px;
            color: #fff;
            background-color: orange;
        }
    </style>
</head>
<body>
    
    <div class="box">
        <div class="left"></div>
        <div class="center">第四种方法：表格布局</div>
        <div class="right"></div>
    </div>

</body>
</html>

5.使用网格布局

<!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>

        *{
            margin: 0;
            padding: 0;
        }

        .box{
            display: grid;
             100%;
            grid-template-rows: 100px;
            grid-template-columns: 300px auto 300px;
        }

        .box .left{
            background-color: red;
        }

        .box .right{
            background-color: blue;
        }

        .box .center{
            text-align: center;
            line-height: 100px;
            color: #fff;
            background-color: orange;
        }
    </style>
</head>
<body>
    
    <div class="box">
        <div class="left"></div>
        <div class="center">第五种方法：网格布局</div>
        <div class="right"></div>
    </div>

</body>
</html>

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原文地址：https://www.cnblogs.com/fangfeiyue/p/7392673.html