Question

我正在尝试使用bootstrap beta 4.0创建一个简单的下拉菜单。我正在使用的是引导文档中的原始代码。代码包含必要的cdns以使引导程序工作。同时也实现了jquery。找不到这种情况发生的原因。有什么帮助吗？提前谢谢。

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">



  <!--Fontawsome-->
  <link rel="stylesheet" href="css/font-awesome.min.css">

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">

  <title>Document</title>
</head>

<body>

  <header>
    <div class="dropdown">
      <button class="btn btn-primary dropdown-toggle" type="button" id="about-us" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">About Us</button>
      <div class="dropdown-menu" aria-labelledby="about-us">
        <a class="dropdown-item" href="#">Our Story</a>
        <a class="dropdown-item" href="#">Our Team</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Contact Us</a>
      </div>
    </div>
  </header>
  <!--Jquery-->

  <script src="js/jquery-3.2.1.min.js"></script>
  <!--Bootstrap Script-->
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>


  <!-- Mod Script -->

</body>

</html>

Answer 1

您必须包含Bootstrap CDN（内容交付网络），您还必须包含jQuery。

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

Answer 2

您应该在Bootstrap 4 document

中加入neceesry CDN

<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/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>

和bootstrap 4 CSS

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" 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/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>

  <!--Fontawsome-->
  <link rel="stylesheet" href="css/font-awesome.min.css">

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">

  <title>Document</title>
</head>

<body>

  <header>
    <div class="dropdown">
      <button class="btn btn-primary dropdown-toggle" type="button" id="about-us" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">About Us</button>
      <div class="dropdown-menu" aria-labelledby="about-us">
        <a class="dropdown-item" href="#">Our Story</a>
        <a class="dropdown-item" href="#">Our Team</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Contact Us</a>
      </div>
    </div>
  </header>
  <!--Jquery-->

  <script src="js/jquery-3.2.1.min.js"></script>
  <!--Bootstrap Script-->
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>


  <!-- Mod Script -->

</body>

</html>

下拉菜单功能不全（bootstrap4.0）

2 个答案: