编辑下面的代码:【加编码】
<html lang="en"> <head> <meta charset="utf-8"> <title>Bootstrap tab based dropdown Navigation Example</title> <meta name="description" content="Bootstrap tab based dropdown Navigation Example"> <link href="/try/bootstrap/twitter-bootstrap-v2/docs/assets/css/bootstrap.css" rel="stylesheet"> <style type="text/css"> .container { margin-top: 200px; } </style> </head> <body> <div class="container"> <div class="row"> <div class="span6"> <ul class="nav nav-tabs"> <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="#">FrontEnd<b class="caret"></b></a> <ul class="dropdown-menu"> <li><a href="#">Twitter Bootstrap</a></li> <li><a href="#">Google Plus API</a></li> <li><a href="#">HTML5</a></li> <li class="divider"> <li><a href="#">Examples</a></li> </ul> </li> <li class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" href="#">BackEnd<b class="caret bottom-up"></b></a> <ul class="dropdown-menu bottom-up pull-right"> <li><a href="#">PHP</a></li> <li><a href="#">MySQL</a></li> <li><a href="#">PostgreSQL</a></li> <li class="divider"> <li><a href="#">Live Demos</a></li> </ul> </li> </ul> </div> </div> </div> <script src="/try/bootstrap/twitter-bootstrap-v2/docs/assets/js/jquery.js"></script> <script src="/try/bootstrap/twitter-bootstrap-v2/docs/assets/js/bootstrap-dropdown.js"></script> <script src="/try/bootstrap/twitter-bootstrap-v2/docs/assets/js/application.js"></script> </body> </html>
结果: 【此窗口】 帮助?
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