css布局，两边宽度固定，中间自适应

布局效果

方法一：flex布局

父元素设置display: flex；

子元素.left, .right都设置宽高为200px，.middle设置flex:1;

贴上代码：

<!DOCTYPE html>
<html lang="en">
<head>

    <meta charset="UTF-8">
    <title>Document</title>
    <style>
    .container {
        display: flex;
        width: 100%;
        height: 100%;
    }
    .left, .right {
        width: 200px;
        height: 200px;
    }
    .left {
        background: #ccc;
    }
    .right {
        background: pink;
    }
    .middle {
        flex: 1;
        height: 200px;
        background: #abcdef;
    }

    </style>
</head>
<body>
    <div class="container">
        <div class="left"></div>
        <div class="middle"></div>
        <div class="right"></div>
    </div>
</body>
<script>


</script>
</html>

View Code

方法二：float + margin

元素.left, .right都设置宽高为200px, .left左浮动， .right右浮动。

.middle设置margin: 0 200px;

贴上代码

<!DOCTYPE html>
<html lang="en">
<head>

    <meta charset="UTF-8">
    <title>Document</title>
    <style>
    .container {
        width: 100%;
        height: 100%;
    }
    .left, .right {
        width: 200px;
        height: 200px;
    }
    .left {
        background: #ccc;
        float: left;
    }
    .right {
        background: pink;
        float: right;
    }
    .middle {
        height: 200px;
        background: #abcdef;
        margin: 0 200px;
    }

    </style>
</head>
<body>
    <div class="container">
        <div class="left"></div>
        <div class="right"></div>
        <div class="middle"></div>
    </div>
</body>
<script>


</script>
</html>

View Code

注意：middle要放在最后，因为float元素会为块级元素让出位置。如果middle在right前，则right会置于下一行（为块级元素middle让出一行位置）

方法三：position + margin

父元素设置position: relative, 子元素.left, .right都设置position: absolute，width: 200px, height: 200px;

.left设置left: 0, top: 0; .right设置right: 0, top: 0;

.middle设置margin: 0 200px;

贴上代码

<!DOCTYPE html>
<html lang="en">
<head>

    <meta charset="UTF-8">
    <title>Document</title>
    <style>
    .container {
        width: 100%;
        height: 100%;
        position: relative;
    }
    .left, .right {
        width: 200px;
        height: 200px;
        position: absolute;
        top: 0;
    }
    .left {
        background: #ccc;
        left: 0;
    }
    .right {
        background: pink;
        right: 0;
    }
    .middle {
        height: 200px;
        background: #abcdef;
        margin: 0 200px;
    }

    </style>
</head>
<body>
    <div class="container">
        <div class="left"></div>
        <div class="right"></div>
        <div class="middle"></div>
    </div>
</body>
<script>


</script>
</html>

View Code

css布局，两边宽度固定，中间自适应

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