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实例代码( Tip: 登录后体验更佳 )
运行代码 
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="//cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
    <script src="//cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
  </head>
  <body>
    <div class="container">
      <h2>实例</h2>
      <p> .caret 类显示了一个下拉的功能: <span class="caret"></span></p>
      <p> .caret 类在按钮中使用：</p>
      <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">Menu <span class="caret"></span></button>
        <ul class="dropdown-menu" role="menu">
          <li><a href="#">一个链接</a></li>
          <li><a href="#">另一个链接 link</a></li>
          <li><a href="#">其他功能</a></li>
        </ul>
      </div>        
    </div>
  </body>
</html>
 
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运行结果
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