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我都是按照老师的步骤来的,但是我不知道哪里错误?求指点

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<script src="js/jquery-3.4.1.js"></script>

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

<title></title>

</head>

<body>

<br />

<br />

<br />

<br />

<div class="dropdown">


<button class="btn btn-default dropdown-toggle" data-toggle="dropdown">

这是按钮

<span class="caret"></span>


</button>

<ul class="dropdown-menu">


<li><a href="http://www.imooc.com">慕课网</a></li>

<li><a href="http://www.imooc.com">慕课网</a></li>

<li><a href="http://www.imooc.com">慕课网</a></li>

</ul>

</div>

</body>

</html>


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