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
<Meta charset="utf-8">
<Meta http-equiv="X-UA-Compatible" content="IE-edge">
<Meta name="viewport" content="width=device-width,initial-scale=1">
Bootstrap 101 Template
nofollow" rel="stylesheet">
nofollow" rel="stylesheet">
<div class="btn-group">
<button type="button" class="btn btn-default">select
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
<span class="caret">
<span class="sr-only">Toggle Dropdown
<script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js">
<script src="http://cdn.bootcss.com/bootstrap/3.3.1/js/bootstrap.min.js">
<script src="http://cdn.bootcss.com/bootstrap/3.3.1/js/npm.js">