案例：Bootstrap案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<head>
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    <meta charset="utf-8">
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    <title>Bootstrap 实例 - 分割的按钮下拉菜单</title>
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    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
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    <script src="/js/bootstrap/jquery.min.js"></script>
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    <script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
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</head>
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<body>
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​
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<div class="btn-group">
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    <button type="button" class="btn btn-default">默认</button>
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    <button type="button" class="btn btn-default dropdown-toggle"
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            data-toggle="dropdown">
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        <span class="caret"></span>
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        <span class="sr-only">切换下拉菜单</span>
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    </button>
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    <ul class="dropdown-menu" role="menu">
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        <li><a href="#">功能</a></li>
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        <li><a href="#">另一个功能</a></li>
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        <li><a href="#">其他</a></li>
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        <li class="divider"></li>
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        <li><a href="#">分离的链接</a></li>
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    </ul>
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</div>
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<div class="btn-group">
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    <button type="button" class="btn btn-primary">原始</button>
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    <button type="button" class="btn btn-primary dropdown-toggle"
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            data-toggle="dropdown">
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        <span class="caret"></span>
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        <span class="sr-only">切换下拉菜单</span>
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    </button>
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    <ul class="dropdown-menu" role="menu">
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        <li><a href="#">功能</a></li>
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        <li><a href="#">另一个功能</a></li>
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        <li><a href="#">其他</a></li>
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        <li class="divider"></li>
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        <li><a href="#">分离的链接</a></li>
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    </ul>
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</div>
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​
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</body>
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</html>