<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>在 .dropdown-menu 中添加 .dropdown-menu-right 类来设置下拉菜单右对齐：</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 dropdown-menu-right" role="menu" aria-labelledby="menu1">
<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"><a role="menuitem" tabindex="-1" href="#">关于我们</a></li>