<title>Bootstrap 实例 - 下拉菜单（Dropdowns）</title>
<link rel="stylesheet" href="https://cdn.staticfile.net/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.net/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.net/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<button type="button" class="btn dropdown-toggle" id="dropdownMenu1"
<span class="caret"></span>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<a role="menuitem" tabindex="-1" href="#">Java</a>
<a role="menuitem" tabindex="-1" href="#">数据挖掘</a>
<a role="menuitem" tabindex="-1" href="#">数据通信/网络</a>
<li role="presentation" class="divider"></li>
<a role="menuitem" tabindex="-1" href="#">分离的链接</a>
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