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<html lang="zh-cn"><head><meta charset="utf-8"><title>多级导航菜单</title><meta name="description" content="多级导航菜单"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><style>.dropdown:hover .menu-top {display: block;}.dropdown-submenu {position: relative;}.dropdown-submenu>.dropdown-menu {top: 0;left: 100%;margin-top: -6px;margin-left: -1px;-webkit-border-radius: 0 6px 6px 6px;-moz-border-radius: 0 6px 6px 6px;border-radius: 0 6px 6px 6px;}.dropdown-submenu:hover>.dropdown-menu {display: block;}.dropdown-submenu>a:after {display: block;content: " ";float: right;width: 0;height: 0;border-color: transparent;border-style: solid;border-width: 5px 0 5px 5px;border-left-color: #cccccc;margin-top: 5px;margin-right: -10px;}.dropdown-submenu:hover>a:after {border-left-color: #ffffff;}.dropdown-submenu .pull-left {float: none;}.dropdown-submenu.pull-left>.dropdown-menu {left: -100%;margin-left: 10px;-webkit-border-radius: 6px 0 6px 6px;-moz-border-radius: 6px 0 6px 6px;border-radius: 6px 0 6px 6px;}</style><!-- 新 Bootstrap 核心 CSS 文件 --><link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.4/css/bootstrap.min.css"><!-- jQuery文件。务必在bootstrap.min.js 之前引入 --><script src="http://cdn.bootcss.com/jquery/1.11.2/jquery.min.js"></script><!-- 最新的 Bootstrap 核心 JavaScript 文件 --><script src="http://cdn.bootcss.com/bootstrap/3.3.4/js/bootstrap.min.js"></script></head><body><div class="container collapse navbar-collapse navbar-ex1-collapse"><ul class="nav navbar-nav"><li class="active"><a href="#">Link</a></li><li><a href="#">Link</a></li><li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Multi Level <b class="caret"></b></a><ul class="dropdown-menu menu-top"> <li><a href="#">Level 1</a></li><li><a href="#">Level 1</a></li><li class="dropdown-submenu"> <a tabindex="-1" href="#">More options</a><ul class="dropdown-menu"><li><a tabindex="-1" href="#">Level 2</a></li><li class="dropdown-submenu"> <a href="#">More..</a><ul class="dropdown-menu"><li><a href="#">Level 3</a></li><li><a href="#">Level 3</a></li><li class="dropdown-submenu"> <a href="#">More..</a><ul class="dropdown-menu"><li><a href="#">Level 4</a></li><li><a href="#">Level 4</a></li><li class="dropdown-submenu"> <a href="#">More..</a><ul class="dropdown-menu"><li><a href="#">Level 5</a></li><li><a href="#">Level 5</a></li></ul></li></ul></li></ul></li><li><a href="#">Level 2</a></li><li><a href="#">Level 2</a></li></ul></li></ul></li> </ul></div></body>
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