html/index.html at master · wodesj33/html · GitHub

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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>css实现下拉菜单的显示和隐藏</title>
    <style type="text/css">
        * {
            margin: 0px;
            padding: 0px;
        }

        #nav {
            background-color: #eee;
            width: 600px;
            height: 40px;
            margin: 0 auto;
        }

        ul {
            list-style: none;
        }

        ul li {
            float: left;
            line-height: 40px;
            text-align: center;
            position:relative;
        }

        a {
            text-decoration: none;
            color: black;
            padding: 0px 10px;
            display: block;
            height: 40px;
        }

        a:hover {
            color: #fff;
            background: #666;
        }
        ul li ul li{float:none;background-color: #eee;margin-top: 2px;}
        ul li ul {position: absolute;left: 0px;top:40px;display: none}
        ul li ul li a:hover{background-color: #06f;}
        ul li:hover ul{display:block;}
    </style>
</head>

<body>
    <div id="nav">
        <ul>
            <li>
                <a href="#"> 首页</a>
            </li>
            <li>
                <a href="#">课程大厅</a>
                <ul>
                    <li><a href="#">Javascript</a></li>
                    <li><a href="#">jQuery</a></li>
                </ul>
            </li>
            <li>
                <a href="#">学习中心</a>
                <ul>
                    <li><a href="#">Javascript</a></li>
                    <li><a href="#">jQuery</a></li>
                </ul>
            </li>
            <li>
                <a href="#">经典案例</a>
            </li>
            <li>
                <a href="#">关于我们</a>
            </li>
        </ul>
    </div>

</body>

</html>