本文实例为大家分享了Bootstrap组合上下拉框的具体代码，供大家参考，具体内容如下
<html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE-edge"> <meta name="viewport" content="width=device-width,initial-scale=1"> <title>Bootstrap 101 Template</title> <link href="http://cdn.bootcss.com/bootstrap/3.3.1/css/bootstrap-theme.min.css" rel="external nofollow" rel="stylesheet"> <link href="http://cdn.bootcss.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="external nofollow" rel="stylesheet"> </head> <body> <!-- 下拉式 --> <div class="btn-group"> <!-- 用于显示文字 --> <button type="button" class="btn btn-default">select</button> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"> <span class="caret"></span> <span class="sr-only">Toggle Dropdown</span> </button> <ul class="dropdown-menu" role="menu"> <li><a href="#" rel="external nofollow" rel="external nofollow" >Action</a></li> </div> <br/> <br/> <br/> <br/> <!-- 上拉式 --> <div class="btn-group dropup"> <button type="button" class="btn btn-default">select</button> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"> <span class="caret"></span> <span class="sr-only">Toggle Dropdown</span> </button> <ul class="dropdown-menu" role="menu"> <li><a href="#" rel="external nofollow" rel="external nofollow" >Action</a></li> </div> <script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script> <script src="http://cdn.bootcss.com/bootstrap/3.3.1/js/bootstrap.min.js"></script> <script src="http://cdn.bootcss.com/bootstrap/3.3.1/js/npm.js"></script> </body> </html> <!-- -->
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