源代码：
左右布局
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Bootstrap 实例 - 标签页与胶囊式标签页</title> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>标签页添加下拉菜单</h2> <ul class="nav nav-tabs" role="tablist"> <li class="active"><a href="#">Home</a></li> <li><a href="#">About</a></li> <li class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" href="#"> 教程 <span class="caret"></span></a> <ul class="dropdown-menu" role="menu"> <li><a href="#">HTML</a></li> <li><a href="#">CSS</a></li> <li><a href="#">JavaScript</a></li> </ul> </li> </ul> </div> </body> </html>
运行结果