简单教程
提交运行
代码编辑器：
<!DOCTYPE htm> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script> <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <style>body {margin:150px 100px;}</style> <div class="btn-group dropup"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">默认 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">功能</a> </li> <li> <a href="#">另一个功能</a> </li> <li> <a href="#">其他</a> </li> <li class="divider"></li> <li> <a href="#">分离的链接</a> </li> </ul> </div> <div class="btn-group dropup"> <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">原始 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">功能</a> </li> <li> <a href="#">另一个功能</a> </li> <li> <a href="#">其他</a> </li> <li class="divider"></li> <li> <a href="#">分离的链接</a> </li> </ul> </div>
运行结果：