css三列布局(两边固定中间自适应)

1.flex布局

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        #box {
            width: 100%;
            height: 100px;
            display: flex;
        }

        #left,
        #right {
            width: 200px;
            height: 100px;
            background-color: #999;
        }

        #center {
            flex: 1;
            height: 100px;
            background-color: #f00;
        }
    </style>
</head>

<body>
    <div id="box">
        <div id="left">left</div>
        <div id="center">center</div>
        <div id="right">right</div>
    </div>
</body>

</html>

2.利用float

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        .left,
        .right {
            width: 200px;
            height: 200px;
            background-color: #999;
        }

        .left {
            float: left;
        }

        .right {
            float: right;
        }

        .center {
            margin: 0 200px;
            height: 200px;
            background-color: #f00;
        }
    </style>
</head>

<body>
    <!--该布局法的好处是受外界影响小，但是不足是 三个元素的顺序，center一定要放在最后，这是                
                    和绝对定位不一样的地方，center占据文档流位置，所以一定要放在最后，左右两个元素位置没有关系。
                    当浏览器窗口很小的时候，右边元素会被击倒下一行。-->
    <div class="left">left</div>
    <div class="right">right</div>
    <div class="center">center</div>

</body>

</html>

3.利用绝对定位(两侧)

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>css三列布局</title>
    <style type="text/css">
        /*左右固定，中间自适应  利用绝对定位*/
        .container {
            width: 100%;
            height: 100%;
            position: relative;
        }

        .left {
            position: absolute;
            left: 0;
            top: 0;
            width: 400px;
            height: 200px;
            background-color: black;
            color: #fff;
        }

        .center {
            /*width: auto;*/
            /*如果没有这一句，那么，center这个div的文字就不会自动换行*/
            margin: 0 400px;
            height: 200px;
            background-color: yellow;
        }

        .right {
            position: absolute;
            top: 0;
            right: 0;
            width: 400px;
            height: 200px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="left">left</div>
        <div class="center">center</div>
        <div class="right">right</div>
    </div>
</body>

</html>

4.利用calc计算中间的div(不推荐)

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        .container {
            overflow: hidden;
        }

        .left,
        .right {
            float: left;
            width: 100px;
            background: red;
        }

        .center {
            float: left;
            width: calc(100% - 200px);
            background: yellow;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="left">left</div>
        <div class="center">center</div>
        <div class="right">right</div>
    </div>
</body>

</html>

5.双飞翼布局

主要利用float和margin-left

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        body {
            min-width: 550px;
        }

        .col {
            float: left;
        }

        #main {
            width: 100%;
            height: 200px;
            background-color: #ccc;
        }

        #main-wrap {
            margin: 0 200px;
            /*这是圣杯和双飞翼最明显的区别，在main内部使用的是margin，而圣杯是直接在container部分使用padding*/
        }

        #left,
        #right {
            width: 200px;
            height: 200px;
            background-color: #0000FF;
        }

        #left {
            margin-left: -100%;
        }

        #right {
            margin-left: -200px;
            background-color: #FF0000;
        }
    </style>
</head>

<body>
    <div id="container">
        <div id="main" class="col">
            <div id="main-wrap"> #main </div>
        </div>
        <div id="left" class="col">#left</div>
        <div id="right" class="col">#right</div>
    </div>
</body>

</html>

6.圣杯布局

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        .wrapper {
            padding: 0 100px;
            overflow: hidden;
        }

        .col {
            position: relative;
            float: left;
        }

        .main {
            width: 100%;
            height: 200px;
            background: yellow;
        }

        .left,
        .right {
            width: 100px;
            height: 200px;
            background: red;
        }

        .left {
            margin-left: -100%;
            left: -100px;
        }

        .right {
            margin-left: -100px;
            right: -100px;
        }
    </style>
</head>

<body>
    <section class="wrapper">
        <section class="col main">main</section>
        <aside class="col left">left</aside>
        <aside class="col right">right</aside>
    </section>
</body>

</html>