BootStrap实现简单响应式导航菜单  　⽤BootStrap实现响应式导航栏，我会对其中的⼀些样式进⾏说明。
  先上代码，是⼀个很简单的Demo。
<!doctype html>
<html>
<head>
<head>
<meta  charset = "utf-8"/>
<meta name = "viewport" content = "width-device=width,initial = 1.0"/>
<!--bootstrap.css -->
<link  href = "css/bootstrap.css" rel = "stylesheet" type = "text/css"/>
<!-- bootstrap.js -->
<script src = "js/jquery-1.9.1.js"></script>
<!-- bootstrap.js -->
<script src = "js/bootstrap.js"></script>
</head>
<body>
<nav class="navbar navbar-default" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#menu">
<span class="sr-only">展开导航</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">⽹站标题</a>
</div>
<div class="collapse navbar-collapse" id="menu">
<ul class="nav navbar-nav">
<li class="active"><a href="#">⾸页</a></li>
<li><a href="#">导航标题1</a></li>
<li><a href="#">导航标题2</a></li>
<li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">下拉菜单<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#">下拉菜单1</a></li>
<li class="divider"></li>
<li><a href="#">下拉菜单2</a></li>
<li class="divider"></li>
</ul>
</li>
js导航栏下拉菜单</ul>
</div>
</nav>
</body>
</html>
　⾸先引⼊基本样式和JS插件：
    <link  href = "css/bootstrap.css" rel = "stylesheet" type = "text/css"/>
<!-- bootstrap.js -->
<script src = "js/jquery-1.9.1.js"></script>
<!-- bootstrap.js -->
<script src = "js/bootstrap.js"></script>
  定义响应式的样式：
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#menu">
<span class="sr-only">展开导航</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">⽹站标题</a>
</div>
　其中：data-toggle="collapse"是数据切换，⽽collapse是动画效果，data-target="#menu"的作⽤则是选择展⽰数据的⽬标，#menu指的便是：<div class="collapse navbar-collapse" id="menu">
<ul class="nav navbar-nav">
<li class="active"><a href="#">⾸页</a></li>
<li><a href="#">导航标题1</a></li>
<li><a href="#">导航标题2</a></li>
<li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">下拉菜单 <b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#">下拉菜单1</a></li>
<li class="divider"></li>
<li><a href="#">下拉菜单2</a></li>
<li class="divider"></li>
</ul>
</li>
</ul>
</div>
　class = "navbar navbar-toggle"则是菜单按钮的样式，其中也可以继续嵌套下拉菜单。

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