我的全部代码如下，我还没有main.js文件.我只是想让下拉菜单工作，但不管我按什么，下拉菜单都不会掉下来.
以下是我的代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Bootstrap</title>
<link rel="stylesheet" href="/node_modules/bootstrap/dist/css/bootstrap.min.css">
</head>
<body>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<script src="/node_modules/bootstrap/dist/js/bootstrap.bundle.js"></script>
</body>
</html>
谢谢!