Question

我在Bootstrap 4.0.0链接中使用了以下内容：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

但是，当我尝试实现基本菜单时，标准链接有效，但是如果我尝试单击Dropdown link菜单，它似乎无能为力。如果单击它，我希望它会下降。

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">

  <ul class="navbar-nav">
              <li class="nav-item"><a href="/">Home</a></li>
              <li class="nav-item"><a href="/link 1">Link 1</a></li>
              <li class="nav-item"><a href="/link 2">Link 2</a></li>
              <li class="nav-item"><a href="/link 3">Link 3</a></li>

    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">Dropdown link</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">link 4</a>
        <a class="dropdown-item" href="#">link 5</a>
        <a class="dropdown-item" href="#">link 6</a>
      </div>
    </li>

  </ul>
</nav>

我在做什么错，为什么菜单没有打开以显示链接4、5和6？

Answer 1

您仅包含了Bootstrap的 CSS 。您需要包含用于引导程序的 JavaScript ，下拉菜单才能正常工作。您还需要在之前包括对Bootstrap JavaScript的引用：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<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>

这是一个工作示例，其中添加了以下内容：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<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>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
  <ul class="navbar-nav">
    <li class="nav-item"><a href="/">Home</a></li>
    <li class="nav-item"><a href="/link 1">Link 1</a></li>
    <li class="nav-item"><a href="/link 2">Link 2</a></li>
    <li class="nav-item"><a href="/link 3">Link 3</a></li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">Dropdown link</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">link 4</a>
        <a class="dropdown-item" href="#">link 5</a>
        <a class="dropdown-item" href="#">link 6</a>
      </div>
    </li>
  </ul>
</nav>

无法使Bootstrap下拉菜单正常工作

1 个答案: