<nav class="navbar navbar-default navbar-fixed-top navbar-inverse" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">现代浏览器博物馆</a>
</div>
<div class="cpllapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">综述</a></li>
<li><a href="#">简述</a></li>
<li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">描述<span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Chrome</a></li>
<li><a href="#">FireFox</a></li>
<li><a href="#">Opera</a></li>
<li class="divider"></li>
<li><a href="#">IE</a></li>
</ul>
</li>
<li><a href="#">关于</a></li>
</ul>
</div>
</div>
</nav>
