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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>我的导航网站</title>
<style>
ul.formal{
color: white;
list-style-type: none;
font-size: 2em;
padding:0px;
cursor:pointer;
background-color:green;
overflow:hidden;
position:absolute;}
li.formal{display:inline;
background-color:green;}
li.formal:hover{background-color:lightgreen;}
ul.hidden{display:non;
background-color:rgb(0,200,0);
display:outline;
list-style-type:none;
font-size:0.5em;
position:relative;
left:-1.7em;}
ul.formal:hover ul.hidden{display:block;
}
</style>
</head>
<body>
<div>
<ul class="formal">
<li class="formal">百度</li>
<ul class="hidden">
<li>百度贴吧</li>
<li>百度百科</li>
<li>百度知道</li>
</ul>
<li class="formal">腾讯</li>
<li>腾讯视频</li>
<li>腾讯新闻</li>
<li>腾讯QQ</li>
</div>
</body>
</html>
输入 JavaScript 代码……
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输入 CSS 代码……
