Bootstrap组合上下拉框,Bootstrap上拉框,Bootstrap下拉框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><!----> 结果： 
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Bootstrap组合上下拉框,Bootstrap上拉框,Bootstrap下拉框
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