炎热的夏天过去了，凉爽的秋天来了。它是一个收获的季节，也是各种水果最多的时候，红艳艳的苹果扒开绿叶往外瞧；小红灯笼似的枣子挂满枝头；像紫玛瑙的葡萄一串串地挂在葡萄架下，真迷人呀！
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 rel="nofollow noopener noreferrer" href="http://cdn.bootcss.com/bootstrap/3.3.1/css/bootstrap-theme.min.css" rel="external nofollow" rel="stylesheet"> <link rel="nofollow noopener noreferrer" 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 rel="nofollow noopener noreferrer" 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 rel="nofollow noopener noreferrer" 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：
本文Bootstrap组合上、下拉框简单实现代码到此结束。不下水，一辈子不会游泳；不扬帆，一辈子不会撑船。小编再次感谢大家对我们的支持！
