Bootstrap 4阿尔法，在导航不工作的下拉列表

Question

我在引导4中修改nav，修建而不是模板，出于某种原因，我的下拉菜单不起作用。我点击他们，他们带我到我插入的任何网站，而不是显示我选择的选项。对于这个问题，我的汉堡包开瓶器也不起作用。有任何想法吗？

<nav class="navbar fixed-top navbar-toggleable-md navbar-inverse" style="background-color: #0E0B16;"> 
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation"> 
     <span class="navbar-toggler-icon"></span> 
    </button> 
    <a class="navbar-brand" href="home.html">EX</a> 
     <div class="collapse navbar-collapse" id="navbarsExampleDefault"> 
      <ul class="navbar-nav mr-auto"> 
       <li class="nav-item active"> 
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a> 
       </li> 
       <li class="nav-item"> 
        <a class="nav-link" href="bio.html">Bio</a> 
       </li> 
       <li class="nav-item dropdown"> 
        <a class="nav-link dropdown-toggle" href="#" role="button" id="dropdownPortfolio" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 
         Portfolio 
        </a> 
        <div class="dropdown-menu" aria-labelledby="dropdownPortfolio"> 
         <a class="dropdown-item" href="filmportfolio.html">Film</a> 
         <a class="dropdown-item" href="stageportfolio.html">Stage</a> 
         <a class="dropdown-item" href="beautyportfolio.html">Beauty</a> 
        </div> 
       </li> 
      </ul> 
      <ul class="nav navbar-nav navbar-sub pull-right"> 
       <li class = "navbar-text"><i class="fa fa-phone" aria-hidden="true"></i> 555-555-5555</li> 
       <li class= "navbar-text"><i class="fa fa-envelope-o" aria-hidden="true"></i> ex@example.com</li> 
      </ul> 
     </div> 
    </nav> 

Answer 1

没有看到完整的网页代码，这仅仅是一个受过教育的猜测，但是，它听起来就像你离开了jQuery和/或bootstrap.js/bootstrap.min.js。汉堡包显示/折叠和下拉菜单取决于该.js文件。