導航組件不工作

Question

導航組件不工作，它不擴展以顯示屏幕尺寸小於768px的可用選項。這是我的代碼如下。

<nav class="nav navbar-default"> 
     <div class="navbar-header"> 
      <button type="button" class="navbar-toggle collapsed" data- 
      toggle="collapse" data-taget="#navbar" >   

       <span class="icon-bar"></span> 
       <span class="icon-bar"></span> 
       <span class="icon-bar"></span> 
      </button> 
     </div> 
     <div id="navbar" class="navbar-collapse collapse" > 
      <ul class="nav navbar-nav"> 
       <li class="active"><a href="#">Home</a></li> 
       <li><a href="#">Contact</a></li> 
       <li><a href="#">About</a></li> 
       <li><a href="#">Products</a></li> 
      </ul> 
      <form class="navbar-form navbar-left" role="search"> 
       <div class="form-group"> 
        <input type="text" class="form-control" 
        placeholder="Search" /> 
       </div> 

       <button type="submit" class="btn btn-default">Submit 
       </button> 
      </form> 

      <ul class="nav navbar-nav navbar-right"> 
       <li><a href="#">Subscribe</a></li> 
      </ul> 
     </div> 
    </nav> 

Answer 1

我更新了你的代碼。

<nav class="navbar navbar-default"> 
    <div class="container-fluid"> 
    <div class="navbar-header"> 
     <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar"> 
     <span class="icon-bar"></span> 
     <span class="icon-bar"></span> 
     <span class="icon-bar"></span> 
     </button> 
    </div> 
    <div class="collapse navbar-collapse" id="navbar"> 
     <ul class="nav navbar-nav"> 
     <li class="active"><a href="#">Home</a></li> 
     <li><a href="#">Contact</a></li> 
     <li><a href="#">About</a></li> 
     <li><a href="#">Products</a></li> 
     </ul> 
     <form class="navbar-form navbar-left" role="search"> 
     <div class="form-group"> 
      <input type="text" class="form-control" placeholder="Search" /> 
     </div> 
     <button type="submit" class="btn btn-default">Submit 
     </button> 
     </form> 
     <ul class="nav navbar-nav navbar-right"> 
     <li><a href="#">Subscribe</a></li> 
     </ul> 
    </div> 
    </div> 
</nav> 

這是工作小提琴。

https://jsfiddle.net/8nyor7xk/