jquery - Bootstrap v4 导航栏错误？

问题来了。我从引导端(https://v4-alpha.getbootstrap.com/components/navbar/)获取了默认导航栏示例。结果显示全尺寸导航栏，当屏幕变小时，导航栏可能会折叠。但是当我将代码插入到我的元素中时，它会显示:

https://ibb.co/fjBNhQ

如您所见，它始终处于折叠状态。我尝试了很多其他示例，但没有任何效果。这是代码:

<!DOCTYPE html>
<html>

<head>
  <title>Test area</title>
  <link rel="stylesheet" href="media/css/bootstrap.min.css">
</head>

<body>
  <div class="header">
    <div class="top-header">
      <div class="container">
        <nav class="navbar navbar-toggleable-md navbar-light bg-faded">
          <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
                              <span class="navbar-toggler-icon"></span>
                          </button>
          <a class="navbar-brand" href="#">Navbar</a>
          <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
            <div class="navbar-nav">
              <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
              <a class="nav-item nav-link" href="#">Features</a>
              <a class="nav-item nav-link" href="#">Pricing</a>
              <a class="nav-item nav-link disabled" href="#">Disabled</a>
            </div>
          </div>
        </nav>
      </div>
    </div>
  </div>
  <script src="media/js/jquery.min.js"></script>
  <script src="media/js/popper.min.js"></script>
  <script src="media/js/bootstrap.min.js"></script>
</body>

</html>

最佳答案

您发布的代码仅适用于 Bootstrap alpha 6，不适用于 beta。这是因为从 Bootstrap 4 beta 开始，navbar-toggleable* 类已更改为 navbar-expand*。

Bootstrap 4.0.0:https://www.codeply.com/go/0c0FC1Lrn2

   <nav class="navbar navbar-expand-lg navbar-light bg-faded">
          <a class="navbar-brand" href="#">Navbar</a>
          <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
          </button>
          <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
            <div class="navbar-nav">
              <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
              <a class="nav-item nav-link" href="#">Features</a>
              <a class="nav-item nav-link" href="#">Pricing</a>
              <a class="nav-item nav-link disabled" href="#">Disabled</a>
            </div>
          </div>
   </nav>

另见:Bootstrap 4 navbar layout works using CDN, breaks using downloaded code

关于jquery - Bootstrap v4 导航栏错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45907022/

jquery - Bootstrap v4 导航栏错误？

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