导航栏（Bootstrap）

<nav class="navbar navbar-default">
<div class="container">
<div class="navbar-header">
<a href="index.html" class="navbar-brand">海涛高软</a>
</div>
<ul class="nav navbar-nav navbar-left">
<li><a href="index.html"><span class="glyphicon glyphicon-home"></span>  后台首页</a></li>
<li class="active"><a href="user_list.html"><span
class="glyphicon glyphicon-user"></span>  用户管理</a></li>
<li><a href="content.html"><span class="glyphicon glyphicon-list-alt"></span>  内容管理</a></li>
<li><a href="tag.html"><span class="glyphicon glyphicon-tags"></span>  标签管理</a></li>
</ul>
</div>
</nav>

1   除一个类是以nav开头的外，其它的都是以navbar开头的
2   要重视ul元素摆在左还是右，要用navbar-left和navbar-righ，不要去考虑用pull-left或pull-right