引導默認導航欄下拉不起作用

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我創建了一個html file引導程序默認導航欄示例from this page。當我在Chrome，Firefox或IE中打開文件時，下拉菜單不起作用。但是，bootstrap webpage showing the example確實可以在Chrome中使用。我究竟做錯了什麼？引導默認導航欄下拉不起作用

來源

2017-02-28 pcantalupo

你需要包括對jQuery的參考，可引導工作。 –

我對web開發完全陌生......我該怎麼做？ TY – pcantalupo

您必須在文件中附加jquery和bootstrap js cdns，如下所示。

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<!DOCTYPE HTML> 
 
<html> 
 

 
<head> 
 

 
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> 
 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> 
 
    <!-- Latest compiled and minified CSS --> 
 
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 
 
</head> 
 

 
<body> 
 
    <nav class="navbar navbar-default"> 
 
    <div class="container-fluid"> 
 
     <!-- Brand and toggle get grouped for better mobile display --> 
 
     <div class="navbar-header"> 
 
     <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> 
 
      <span class="sr-only">Toggle navigation</span> 
 
      <span class="icon-bar"></span> 
 
      <span class="icon-bar"></span> 
 
      <span class="icon-bar"></span> 
 
     </button> 
 
     <a class="navbar-brand" href="#">Brand</a> 
 
     </div> 
 

 
     <!-- Collect the nav links, forms, and other content for toggling --> 
 
     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> 
 
     <ul class="nav navbar-nav"> 
 
      <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li> 
 
      <li><a href="#">Link</a></li> 
 
      <li class="dropdown"> 
 
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a> 
 
      <ul class="dropdown-menu"> 
 
       <li><a href="#">Action</a></li> 
 
       <li><a href="#">Another action</a></li> 
 
       <li><a href="#">Something else here</a></li> 
 
       <li role="separator" class="divider"></li> 
 
       <li><a href="#">Separated link</a></li> 
 
       <li role="separator" class="divider"></li> 
 
       <li><a href="#">One more separated link</a></li> 
 
      </ul> 
 
      </li> 
 
     </ul> 
 
     <form class="navbar-form navbar-left"> 
 
      <div class="form-group"> 
 
      <input type="text" class="form-control" placeholder="Search"> 
 
      </div> 
 
      <button type="submit" class="btn btn-default">Submit</button> 
 
     </form> 
 
     <ul class="nav navbar-nav navbar-right"> 
 
      <li><a href="#">Link</a></li> 
 
      <li class="dropdown"> 
 
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a> 
 
      <ul class="dropdown-menu"> 
 
       <li><a href="#">Action</a></li> 
 
       <li><a href="#">Another action</a></li> 
 
       <li><a href="#">Something else here</a></li> 
 
       <li role="separator" class="divider"></li> 
 
       <li><a href="#">Separated link</a></li> 
 
      </ul> 
 
      </li> 
 
     </ul> 
 
     </div><!-- /.navbar-collapse --> 
 
    </div><!-- /.container-fluid --> 
 
    </nav> 
 
</body> 
 

 
<!-- Latest compiled and minified JavaScript --> 
 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script> 
 

 
</html>

來源

2017-02-28 15:19:18 AVI

你需要包括jQuery的參考引用的是引導的JavaScript，使引導工作之前。而且你還要移動現有script元素body元素裏面，我想：

</nav> 
    <!-- Latest compiled and minified JavaScript --> 
    <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script> 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script> 
</body> 
</html>

Here's a working fiddle，即使外部資源不是HTML代碼中可見。

來源

2017-02-28 15:24:45

當你是新來的aition上述答案web開發我想補充兩個points--

一號從來沒有在你的頁面中添加DNS引導兩次，這將創造一切有點麻煩。

二號

添加CDN S IN以下order--

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> 
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

來源

2017-02-28 16:40:43 neophyte

引導默認導航欄下拉不起作用

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