汉堡菜单未打开（引导程序）

Question

我已经实现了从 BootStrap 文档中获得的导航栏。 当我将其折叠为移动版本时，会显示汉堡菜单，但单击它没有任何作用。 这是下面的代码：

<nav class="navbar navbar-expand-lg navbar-dark" style="background-color: #000000;">
        <a class="navbar-brand" href="#">Salman's Website</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
          </button>
          <div class="collapse navbar-collapse" id="navbarNav">
            <ul class="nav navbar-nav ml-auto">
              <li class="nav-item active">
                <a class="nav-link" href="index.html">Home<span class="sr-only">(current)</span></a>
              </li>
              <li class="nav-item active">
                <a class="nav-link" href="electric.html">Electric<span class="sr-only">(current)</span></a>
              </li>
              <li class="nav-item active">
                <a class="nav-link" href="gasoline.html">Gasoline<span class="sr-only">(current)</span></a>
              </li>
              <li class="nav-item active">
                <a class="nav-link" href="hybrid.html">Hybrid<span class="sr-only">(current)</span></a>
              </li>
            </ul>
          </div>
      </nav>

我也将<meta name="viewport" content="width=device-width, initial-scale=1.0">放在了 head 标签中。

提前致谢。

Answer 1

您可能没有导入 bootstrap 的javascript文件。 所以如果你导入它，它运行良好：

 <!-- IMPORT BOOTSTRAP STYLES --> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous"> <!-- IMPORT BOOTSTRAP SCRIPTS--> <script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script> <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script> <nav class="navbar navbar-expand-lg navbar-dark" style="background-color: #000000;"> <a class="navbar-brand" href="#">Salman's Website</a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="nav navbar-nav ml-auto"> <li class="nav-item active"> <a class="nav-link" href="index.html">Home<span class="sr-only">(current)</span></a> </li> <li class="nav-item active"> <a class="nav-link" href="electric.html">Electric<span class="sr-only">(current)</span></a> </li> <li class="nav-item active"> <a class="nav-link" href="gasoline.html">Gasoline<span class="sr-only">(current)</span></a> </li> <li class="nav-item active"> <a class="nav-link" href="hybrid.html">Hybrid<span class="sr-only">(current)</span></a> </li> </ul> </div> </nav>