Bootstrap导航栏不会在手机上缩小

Question

如果我只是缩小在Chrome中的窗口，navbar将按预期工作，但是当我进入Chrome的设备模拟器时，navbar决不会更改为切换按钮。

<nav id="mainNav" class="navbar navbar-default navbar-fixed-top affix-top" style="border:0;background-color:transparent;position:absolute;"> 
    <div class="container-fluid" style="padding: 20px 15% 0;"> 
     <div class="navbar-header"> 
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> 
       <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 page-scroll" href="#page-top"><img class="img-responsive" src="/logo.png"></a> 
     </div> 
     <div class="navbar-collapse collapse" id="bs-example-navbar-collapse-1" aria-expanded="false" style="height: 1px;"> 
      <ul class="nav navbar-nav navbar-right"> 
       <li> 
        <a class="page-scroll" href="#about"> 
         <span>Rewards</span> 
        </a> 
       </li> 
       <li> 
        <a class="page-scroll" href="#services"> 
         <span>Member Care</span> 
        </a> 
       </li> 
       <li> 
        <a class="page-scroll" href="#portfolio"> 
         <span>Sign Up</span> 
        </a> 
       </li> 
       <li> 
        <a class="page-scroll login-btn" href="#login-form"> 
         Log In <i class="fa fa-user"></i> 
        </a> 
       </li> 
      </ul> 
     </div> 
    </div> 
</nav> 

Answer 1

你可以通过确认您已经开始设置的视口元标记在你的页面

<meta name="viewport" content="width=device-width, initial-scale=1.0">