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html - Bootstrap 4下拉菜单有问题

问题描述

出于某种原因，我的下拉菜单在 bootstrap4 中不起作用。我有 jquery、bootstrap，但我不完全确定 popper 是否正确导入。想知道是否有人可以指出我是否做错了什么。

<!DOCTYPE html>
<html>
<head>
    <title>Learning BootStrap</title>

    <link rel="stylesheet" href="css/bootstrap.min.css">

    <script src="js/jquery.min.js"  ></script>

    <script src="js/bootstrap.min.js" ></script>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"> </script>



</head>

<body>


<p class="lead text-center">This is my website.</p>
<div class="dropdown">

<button class="btn btn-primary dropdown-toggle" data-toggle="dropdown">Menu</button/>
    <div class="dropdown-menu">

        <a href="#" class="dropdown-item">first link</a>
        <a href="#" class="dropdown-item">second link</a>
        <a href="#" class="dropdown-item">third link</a>


</div>
</div>






</body>
</html>

标签： htmlbootstrap-4popper.js

解决方案

您下载的版本可能是缩小版。我这么说是因为它指的是类似的东西js/bootstrap.min.js。

您必须包含它们jquery并在它们popper的帮助下在下载版本stackpath link中不可用。bootstrap下面是您应该使用的代码，以使该下拉菜单可用！

<!DOCTYPE html>
<html>

<head>
  <title>Learning BootStrap</title>



<!-- ----------------------------Link you have to include before your css and js file -->

  <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>



  <!-- ----------------------------Your File --> 

  <link rel="stylesheet" href="css/bootstrap.min.css">
  <script src="js/bootstrap.min.js"></script>


</head>

<body>


  <p class="lead text-center">This is my website.</p>
  <div class="dropdown">

    <button class="btn btn-primary dropdown-toggle" data-toggle="dropdown">Menu</button>
    <div class="dropdown-menu">

      <a href="#" class="dropdown-item">first link</a>
      <a href="#" class="dropdown-item">second link</a>
      <a href="#" class="dropdown-item">third link</a>


    </div>
  </div>





</body>


</html>

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