我不明白为什么我使用引导程序4.3.1的下拉列表无法正常运行。
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<html>
<head>
<link href="/css/site.css" rel="stylesheet">
<link href="/css/Dashboard.css" rel="stylesheet">
<link href="/lib/bootstrap/dist/css/bootstrap.css" rel="stylesheet">
</head>
<body>
<header>
<nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">
<div class="container">
<a class="navbar-brand" href="/">VideoOnDemand.Admin</a>
<button class="navbar-toggler" aria-expanded="false" aria-controls="navbarSupportedContent" aria-label="Toggle navigation" type="button" data-target=".navbar-collapse" data-toggle="collapse">
<span class="navbar-toggler-icon"></span>
</button>
<div class="navbar-collapse collapse">
<ul class="navbar-nav">
<!-- Dropdown -->
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" id="navbardrop" href="#" data-toggle="dropdown">
Admin
</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="">Instructor</a>
<a class="dropdown-item" href="">User</a>
<a class="dropdown-item" href="">Course</a>
<a class="dropdown-item" href="">Module</a>
<a class="dropdown-item" href="">Download</a>
<a class="dropdown-item" href="">Video</a>
<a class="dropdown-item" href="">UserCourse</a>
</div>
</li>
</ul>
</div>
</div>
</nav>
</header>
<div class="container">
</div>
<script src="/lib/jquery/dist/jquery.js"></script>
<script src="/lib/bootstrap/dist/js/bootstrap.js"></script>
</body>
</html>