<title>Bootstrap 实例 - 下拉菜单（Dropdown）插件方法</title>
<link href="//libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
<script src="//libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script src="//libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
<nav class="navbar navbar-default" role="navigation">
<div class="navbar-header">
<a class="navbar-brand" href="#">W3Cschool</a>
<ul class="nav navbar-nav">
<li class="active"><a href="#">iOS</a></li>
<li><a href="#">SVN</a></li>
<li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Java <b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a id="action-1" href="#">meter</a></li>
<li><a href="#">EJB</a></li>
<li><a href="#">Jasper Report</a></li>
<li class="divider"></li>
<li><a href="#">分离的链接</a></li>
<li class="divider"></li>
<li><a href="#">另一个分离的链接</a></li>
$(".dropdown-toggle").dropdown('toggle');