<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1, user-scalable=no"> <title>导航加入下拉菜单</title> <link rel="stylesheet" href="css/bootstrap.css"> <script src="js/jquery.js"></script> <script src="js/bootstrap.min.js"></script> </head> <body> <ul class="nav nav-tabs"> <li><a href="#">首页</a></li> <li><a href="#">首页</a></li> <li><a href="#">首页</a></li> <li><a href="#">首页</a></li> <li><a href="#">首页</a></li> <li class="dropdown"> <a href="#" data-toggle="dropdown">更多 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">超清</a></li> <li><a href="#">超清</a></li> <li><a href="#">超清</a></li> </ul> </li> </ul> <body> </html>
示例图：
