<!DOCTYPE html>
<html>
<head>
<title>下拉菜单实例|菜鸟教程(runoob.com)</title>
<meta charset="utf-8">
<style>
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none; /* 这个必须是none,也就是鼠标不放在div上,不会显示这部分内容*/
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;
text-decoration: none;
display: block;
}
.dropdown-content a:hover
{background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block; /* 覆盖display: none;变成display: block;*/
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
</style>
</head>
<body>
<h3>下拉菜单</h3>
<p>鼠标移动到按钮上打开下拉菜单。</p>
<div class="dropdown">
<button class="dropbtn">下拉菜单</button>
<div class="dropdown-content">
<a href="http://lvnian.blog.51cto.com/">教程 1</a>
<a href="http://lvnian.blog.51cto.com/">教程 2</a>
<a href="http://lvnian.blog.51cto.com/">教程 3</a>
<a href="http://lvnian.blog.51cto.com/">教程 4</a>
</div>
</div>
</body>
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