引导程序下拉4.0.0 BETA

我有一个新版本的引导（4.0.0测试版）的问题，我想使用新版本的导航栏下拉，但它不起作用。我尝试在文档中的例子，但它不工作，任何人有一个想法？引导程序下拉4.0.0 BETA

这是我的代码：

<nav class="navbar navbar-expand-lg navbar-light bg-light"> 
    <a class="navbar-brand" href="#">Navbar</a> 
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation"> 
     <span class="navbar-toggler-icon"></span> 
    </button> 
    <div class="collapse navbar-collapse" id="navbarNavDropdown"> 
     <ul class="navbar-nav"> 
      <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="#">Features</a> 
      </li> 
      <li class="nav-item"> 
       <a class="nav-link" href="#">Pricing</a> 
      </li> 
      <li class="nav-item dropdown"> 
       <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 
      Dropdown link 
     </a> 
       <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> 
        <a class="dropdown-item" href="#">Action</a> 
        <a class="dropdown-item" href="#">Another action</a> 
        <a class="dropdown-item" href="#">Something else here</a> 
       </div> 
      </li> 
     </ul> 
    </div> 
</nav>

来源

2017-08-13 SWIS

你需要jQuery和引导JS添加到页面中为它工作。请参阅下面的代码片段。

本质上，扩展导航栏的功能是在引导程序中使用JS实现的，引导程序需要JQuery才能使功能正常工作。因此单独导入CSS不足以让导航栏正常工作。

你可以阅读更多关于它here和here。

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> 
 
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous"> 
 

 
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script> 
 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script> 
 

 
<nav class="navbar navbar-expand-lg navbar-light bg-light"> 
 
    <a class="navbar-brand" href="#">Navbar</a> 
 
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation"> 
 
<span class="navbar-toggler-icon"></span> 
 
    </button> 
 
    <div class="collapse navbar-collapse" id="navbarNavDropdown"> 
 
    <ul class="navbar-nav"> 
 
     <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="#">Features</a> 
 
    </li> 
 
    <li class="nav-item"> 
 
    <a class="nav-link" href="#">Pricing</a> 
 
    </li> 
 
    <li class="nav-item dropdown"> 
 
    <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 
 
     Dropdown link 
 
    </a> 
 
    <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> 
 
     <a class="dropdown-item" href="#">Action</a> 
 
     <a class="dropdown-item" href="#">Another action</a> 
 
     <a class="dropdown-item" href="#">Something else here</a> 
 
    </div> 
 
    </li> 
 
</ul> 
 
    </div> 
 
</nav>

来源

2017-08-13 09:55:42 Nisarg

试图弄明白一小时后，这是解决方案。我认为关键的是进口（特别是在'bootstrap.min.js'之前输入'popper'）。 – Matt

引导程序下拉4.0.0 BETA

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