分析bootstrap导航栏及其响应式的实现方式

本文目地：分析bootstrap导航栏及其响应式的实现方式，是自己的编程技术更上一层楼

我们首先来分析一下怎么实现，第一步先贴一个bootstrap的导航栏模板

2.代码如下

 1 <nav class="navbar navbar-default navbar-fixed-top"> 2         
 <div class="container-fluid"> 3           <div class="navbar-header"> 4             
 <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" 
 data-target="#navbar" aria-expanded="false" aria-controls="navbar"> 5               
 <span class="sr-only">Toggle navigation</span> 6               
 <span class="icon-bar"></span> 7               
 <span class="icon-bar"></span> 8               <span class="icon-bar"></span> 9             
 </button>10             <a class="navbar-brand" href="#">Project name</a>11           
 </div>12           <div id="navbar" class="navbar-collapse collapse">13             
 <ul class="nav navbar-nav">14               <li class="active"><a href="#">Home</a>
 </li>15               <li><a href="#">About</a></li>16               
 <li><a href="#">Contact</a></li>17               <li class="dropdown">18                 
 <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>19                 <ul class="dropdown-menu">20                   <li><a href="#">Action</a></li>21                   <li><a href="#">Another action</a></li>22                   <li><a href="#">Something else here</a></li>23                   <li role="separator" class="divider"></li>24                   <li class="dropdown-header">Nav header</li>25                   <li><a href="#">Separated link</a></li>26                   <li><a href="#">One more separated link</a></li>27                 </ul>28               </li>29             </ul>30             <ul class="nav navbar-nav navbar-right">31               32             </ul>33           </div><!--/.nav-collapse -->34         </div><!--/.container-fluld -->35       </nav> 

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