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CSS之height: 100%和height: auto的区别

程序员文章站 2022-05-01 12:29:23
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height: auto —— 是指根据块内内容自动调节高度（高度自然撑开）
height:100% —— 是指其相对父块高度而定义的高度，也就是按照离它最近且有定义高度的父层的高度来定义高度

例：随着窗口宽度的改变，导航栏的位置发生变化（大于700时为侧边导航栏，700到400之间为顶部水平导航栏，小于400为顶部垂直导航栏）

<!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>
        body {
            margin: 0;
        }
        ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
            overflow: auto;
            background: rgb(208, 208, 208);
            position: fixed;
            width: 25%;
            height: 100%;
            top: 0;
        }
        ul li {
            display: block;
            padding: 14px 16px;
            text-align: center;
        }
        ul li:hover {
            background: rgb(173, 173, 173);
            cursor: pointer;
            color: white;
        }
        div {
            margin-left: 25%;
            padding: 1px 16px;
            height: 1000px;
        }
        @media screen and (max-width:700px) {
            ul {
                width: 100%;
                height: auto;
                position: relative;
            }
            ul li {
                float: left;
            }
            div {
                margin-left: 0;
            }
        }
        @media screen and (max-width: 400px) {
            ul li {
                float: none;
            }
        }
    </style>
</head>
<body>
    <ul>
        <li>主页</li>
        <li>推荐</li>
        <li>摄影</li>
        <li>娱乐</li>
    </ul>
    <div>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
    </div>
</body>
</html>
相关标签： CSS

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