案例:Bootstrap案例     状态:可编辑再运行    进入横版
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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 - 垂直的按钮组</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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<div class="btn-group-vertical">
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    <button type="button" class="btn btn-default">按钮 1</button>
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    <button type="button" class="btn btn-default">按钮 2</button>
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    <div class="btn-group-vertical">
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        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
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            下拉
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            <span class="caret"></span>
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        </button>
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        <ul class="dropdown-menu">
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            <li><a href="#">下拉链接 1</a></li>
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            <li><a href="#">下拉链接 2</a></li>
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        </ul>
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    </div>

 运行结果 
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