Bootstrap导航栏不能在手机屏幕上打开

Question

我想下面的HTML在屏幕上添加导航栏。当我调整窗口的大小以显示切换按钮时，单击它，什么也不做。任何缺少的HTML？

感谢

 <!-- Navigation --> 
    <nav class="navbar navbar-default" role="navigation"> 
     <div class="container"> 
      <!-- Brand and toggle get grouped for better mobile display --> 
      <div class="navbar-header"> 
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#proj-navbar"> 
       <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="#">Project Name</a> 
      </div> 
      <!-- Collect the nav links, forms, and other content for toggling --> 
      <div class="collapse navbar-collapse" id="proj-navbar"> 
      <ul class="nav navbar-nav"> 
       <li><a href="#">Initiation</a></li> 
       <li class="active"><a href="#">Implementation</a></li> 
       <li><a href="#">Close Out</a></li> 
      </ul> 
      </div><!--/.nav-collapse --> 
     </div><!--/.container-fluid --> 
    </nav> 

Answer 1

检查一下您是否正确链接CSS和引导的js文件。这些是可折叠菜单工作所必需的。

https://github.com/twbs/bootstrap/releases/download/v3.3.0/bootstrap-3.3.0-dist.zip

如果你希望尽量减少你的JavaScript文件，你可以使用可折叠的插件，因为响应菜单取决于它： http://getbootstrap.com/javascript/#collapse