Mobile 为什么我的引导菜单在桌面上可以正确折叠,但在我测试的任何设备上都不能?

Mobile 为什么我的引导菜单在桌面上可以正确折叠,但在我测试的任何设备上都不能?,mobile,twitter-bootstrap-3,Mobile,Twitter Bootstrap 3,我正在使用引导构建一个站点,当我调整浏览器大小时,菜单栏会正确折叠,但是当我在移动和平板设备(三星s3 mini和nexus7)上测试它时,菜单栏不会折叠 请提供相关代码我还附上了我错过的屏幕快照 <!-- Custom Bootstrap core CSS --> <link href="css/custom-bootstrap.css" rel="stylesheet" type="text/css"> <!-- Cus

我正在使用引导构建一个站点,当我调整浏览器大小时,菜单栏会正确折叠,但是当我在移动和平板设备(三星s3 mini和nexus7)上测试它时,菜单栏不会折叠



请提供相关代码我还附上了我错过的屏幕快照
    <!-- Custom Bootstrap core CSS -->
 <link href="css/custom-bootstrap.css" rel="stylesheet" type="text/css">

  <!-- Custom styles  -->
  <link href="css/style.css" rel="stylesheet" type="text/css">

<!-- Just for debugging purposes. Don't actually copy this line! -->
<!--[if lt IE 9]><script src="../../assets/js/ie8-responsive-file-warning.js"></script>   <![endif]-->

<!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
   <!--[if lt IE 9]>
  <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
  <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
 <![endif]-->
 </head>

 <body>
 <div class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
       <a href="index.html" class="navbar-brand">Priory Carpets and Beds</a>
       <button class="navbar-toggle" type="button" data-toggle="collapse" data-   target="#navbar-main">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      </div>
      <div class="navbar-collapse collapse" id="navbar-main">
      <ul class="nav navbar-nav navbar-right">

                    <li  class="active">
         <a href="index.html">Home</a>           
          </li>

        <li>
         <a href="about.html">About</a>           
          </li>
        <li>
          <a href="services.html">Services</a> 
        </li>
        <li>
          <a href="contact.html">Contact</a> 
        </li>

      </ul>
    </div>
  </div><!-- end nav -->
</div>