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<!DOCTYPE html>
<html>
<head>
<title>下拉菜单实例|菜鸟教程(runcodex.com)</title>
<meta charset="utf-8">
<style>
ul{
list-style-type:none;
margin:0;
padding:0;
overflow:hidden;
background-color:#333;
}
li{
float:left;
li a, .dropbtn
{
display:inline-block;
color:white;
text-align:center;
padding:14px 16px;
text-decoration:none;
li a:hover, .dropdown:hover, .dropbtn
background-color:#111;
.dropdown
.dropdown-content
display:none;
position:absolute;
background-color:#f9f9f9;
min-width:160px;
box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);
.dropdown-content a
color:black;
padding:12px 16px;
display:block;
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content
</style>
</head>
<body>
<ul>
<li><a class="active" href="#home">主页</a></li>
<li><a href="#news">新闻</a></li>
<div class="dropdown">
<a href="#" class="dropbtn">下拉菜单</a>
<div class="dropdown-content">
<a href="#">链接 1</a>
<a href="#">链接 2</a>
<a href="#">链接 3</a>
</div>
</ul>
<h3>导航栏上的下拉菜单</h3>
<p>鼠标移动到 "下拉菜单" 链接先显示下拉菜单。</p>
</body>
</html>
输入 JavaScript 代码……
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输入 CSS 代码……