Bootstrap CSS组件之下拉菜单(dropdown)
Bootstrap下拉菜单，常用在开发项目中，今天为大家介绍介绍
dropdown、dropdown-menu、dropdown-header、divider、dropdown-submenu
例子见下拉菜单.html
//源码
.dropup,
.dropdown {
position: relative;
}
.dropdown-toggle:focus {
outline: 0;
}
.dropdown-menu {
position: absolute;
top: 100%;
left: 0;
z-index: 1000;
display: none;
float: left;
min-width: 160px;
padding: 5px 0;
margin: 2px 0 0;
font-size: 14px;
text-align: left;
list-style: none;
background-color: #fff;
-webkit-background-clip: padding-box;
background-clip: padding-box;
border: 1px solid #ccc;
border: 1px solid rgba(0, 0, 0, .15);
border-radius: 4px;
-webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
}
.dropdown-menu.pull-right {
right: 0;
left: auto;
}
.dropdown-menu .divider {
height: 1px;
margin: 9px 0;
overflow: hidden;
background-color: #e5e5e5;
}
.dropdown-header {
display: block;
padding: 3px 20px;
font-size: 12px;
line-height: 1.42857143;
color: #777;
white-space: nowrap;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- Bootstrap从3.0版本开始全面支持移动平台，贯彻移动先行宗旨 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap 101 Template</title>
<!-- Bootstrap -->
<link href="bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<!-- -->
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
我的书籍<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">编程</a></li>
<li><a href="#">设计</a></li>
<li><a href="#">深入</a></li>
</ul>
</div>
<!-- dropdown/dropdown-menu/dropdown-header -->
<div class="dropdown">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
我的书籍<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li class="dropdown-header">前端</a></li>
<li><a href="#">JS</a></li>
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li class="divider"></li>
<li class="dropdown-header">后台</li>
<li><a href="#">PYTHON</a></li>
<li><a href="#">JAVA</a></li>
</ul>
</div>
<!-- bootstrap是基于jQuery-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
</body>
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