在移动设备中看不到引导程序导航栏切换按钮

Question

我在我的网站上使用twitter Bootstrap,它上面有一个固定的导航栏.当我在桌面浏览器中调整窗口大小时,一切都很好.当我在移动设备上打开同一个站点时,我可以看到navbar-brand但不能切换按钮.我发布截图以便更好地理解(第一个是桌面firefox,第二个是android):

这真让我抓狂!!!

代码:

.navbar-floating {
  background: black;
  color: #5b5656;
  width: 100%;
  border-radius: 0;
}
.navbar-floating .navbar-brand {
  color: #810000;
  font-size: 20px;
  text-transform: uppercase;
}
.navbar-floating .navbar-brand:after {
  content: ' | ';
  color: #810000;
  position: relative;
  top: -3px;
}
#floating-nav {
  position: fixed;
  /* display: none; */
  top: 0;
  width: 100%;
  height: 50px;
}
#floating-nav.navbar {
  min-height: 1px;
}
#floating-nav ul li a {
  font-size: 20px;
}
#floating-nav ul li a:hover {
  background: none;
}

<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.0/css/bootstrap.css">

<nav class="navbar navbar-floating navbar-default" role="navigation" id="floating-nav" >
  <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="#hidden-nav">
        <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 scroll-top" href="#">DSA Media Group</a> </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="hidden-nav">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#" class="scroll-link" data-id="slides">Home</a></li>
        <li><a href="#" class="scroll-link" data-id="about">Agency</a></li>
        <li><a href="#" class="scroll-link" data-id="capabilities">Capabilities</a></li>
        <li><a href="#" class="scroll-link" data-id="projects">Projects</a></li>
        <li><a href="#" class="scroll-link" data-id="clients">Clients</a></li>
        <li><a href="#" class="scroll-link" data-id="contact">Contact</a></li>
      </ul>
    </div>
    <!-- /.navbar-collapse --> 
  </div>
  <!-- /.container --> 
</nav>

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.0/js/bootstrap.js"></script>

我究竟做错了什么？任何帮助深表感谢.

Answer 1

只需在包含元素的div中添加一个navbar-default类,<ul>如下所示:

<div class="collapse navbar-collapse navbar-default" id="hidden-nav">
  <ul class="nav navbar-nav">
      ....
  </ul>
</div>