我正在使用Bootstrap导航栏类，单击该下拉列表时无法将其展开。
我关注了这篇帖子Can't expand navbar dropdown menu，但是我的代码似乎遵循那里的建议。文本确实会根据视口消失（隐藏的sm），但不会显示用于更改密码和注销的下拉链接。任何帮助表示赞赏。
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<div class="navbar navbar-inverse navbar-fixed-top navbar-custom">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="navbar-collapse collapse" aria-expanded="false">
<ul class="nav navbar-nav">
<li><a href="/" title="Events">Event List</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#" aria-expanded="false"><i class="far fa-user"></i> <span class="hidden-sm">User name</span> <i class="caret"></i></a>
<ul class="dropdown-menu">
<li><a href="/Account/ChangePassword" title="">Change Password</a></li>
<li><a href="/Account/LogOut" title="End your session and return to the log in screen">Log Off</a></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>