用bootstrap实现导航栏的基本代码框架

仅仅显示标题，导航菜单：

<nav class="navbar navbar-default" role="navigation">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>

<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
<li><a href="#">Link</a></li>

</ul>

</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>

网页上的显示效果：手机端的显示效果：将

<div class="container-fluid">

换成

<div class="container">

得到下面的效果：即将导航条居中。将

<nav class="navbar navbar-default" role="navigation">

换成

<nav class="navbar navbar-default navbar-inverse" role="navigation">

得到下面效果：即以黑色背景显示。内容自己改，不解释。将

<nav class="navbar navbar-default navbar-inverse" role="navigation">

换成

<nav class="navbar navbar-default navbar-fixed-top navbar-inverse" role="navigation">

使导航条一直位于顶部。添加

<style>
body{
padding-top: 70px;
}
</style>

使导航条不遮挡下面正文的内容。具体可以自己试一下。

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