<title>Bootstrap 实例 - 下拉菜单</title>
<link rel="stylesheet" href="http://edu.jb51.net/libs/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="http://edu.jb51.net/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://edu.jb51.net/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<p>.dropdown-header 类用于在下拉菜单中添加标题：</p>
<button class="btn btn-default dropdown-toggle" type="button" id="menu1" data-toggle="dropdown">教程
<span class="caret"></span></button>
<ul class="dropdown-menu" role="menu" aria-labelledby="menu1">
<li role="presentation" class="dropdown-header">下拉菜单标题 1</li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">HTML</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">CSS</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">JavaScript</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation" class="dropdown-header">下拉菜单标题 2</li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">关于我们</a></li>