Bootstrap 4下拉菜单不工作？

问题描述：

我复制了官方Bootstrap 4下拉菜单的例子，但它不工作，这是没有什么被放下。Bootstrap 4下拉菜单不工作？

<li class="nav-item dropdown"> 
    <a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a> 
    <div class="dropdown-menu" aria-labelledby="dropdown01"> 
    <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>

为我工作的末尾添加这些行？ –

是的，我包括bootstrap.css，jquery.js和bootstrap.js – komodoedit

你包括什么bootstrap 4版本（bootstrap.js，css）？ –

答

编辑：万一别人是有这个问题，我相信OP的解决方案是，他尚未导入popper.js。

检查jQuery和所有相关的Bootstrap组件。同时检查控制台并确保没有错误。

<!DOCTYPE html> 
 
<html lang="en"> 
 
<head> 
 
    <!-- Required meta tags --> 
 
    <meta charset="utf-8"> 
 
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> 
 

 
    <!-- Bootstrap CSS --> 
 
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous"> 
 
</head> 
 
<body> 
 
    <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> 
 

 
    <!-- Optional JavaScript --> 
 
    <!-- jQuery first, then Popper.js, then Bootstrap JS --> 
 
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> 
 
    <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> 
 
</body> 
 
</html>

答

确保包括引导CSS或者通过Bootstrap CDN 或下载并本地链接它

包含bootstrap.css，其他组件正在工作。 – komodoedit

答

这是一个与popper.js文件的问题。我在官方网站找到的是bundle文件本身包含popper，但不包括jquery。我设法通过增加链接到这些文件来解决这个问题：

bootstrap.bundle.js
bootstrap.bundle.min.js

我删除popper.js但因为它来自捆绑文件中。

答

尝试在https://jsbin.com/bumeqopuwu/edit?html,output ..你有没有适当地包括的lib文件

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script> 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script> 
</body> 
</html>

Bootstrap 4下拉菜单不工作？

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