<title>Bootstrap 实例 - 下拉菜单</title>
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<p>.dropdown 菜单用于指定下拉菜单，下拉菜单都包裹在 .dropdown 里。</p>
<p>.dropdown-menu 类用于实际下拉菜单的创建。</p>
<button class="btn btn-default dropdown-toggle" type="button" id="menu1" data-toggle="dropdown">教程
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<li role="presentation"><a role="menuitem" tabindex="-1" href="#">JavaScript</a></li>
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