在我的应用程序中使用 sb 管理面板 2。我想在侧菜单中制作二级菜单，但是当我这样做时，二级菜单总是打开的。我想要当我点击一级菜单然后出现二级菜单。无法理解问题出在哪里。
<div class="navbar-default sidebar" role="navigation">
<div class="sidebar-nav navbar-collapse">
<ul class="nav" id="side-menu">
<li class="sidebar-search">
<div class="input-group custom-search-form">
<input type="text" class="form-control" placeholder="Search...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
<!-- /input-group -->
</li>
<li>
<a href="index.php"><i class="fa fa-dashboard fa-fw"></i> Dashboard</a>
</li>
<li>
<a href="#"><i class="fa fa-dashboard fa-fw"></i>Sudent <span class="fa arrow"></span></a>
<ul class="nav nav-second-level">
<li>
<a href="student/studentlistdb.php">Student</a>
</li>
<li>
<a href="subject/subjectlistdb">Subject</a>
</li>
</ul>
</li>
<li>
<a href="#"><i class="fa fa-dashboard fa-fw"></i>Routine <span class="fa arrow"></span></a>
</li>
</ul>
</div>
<!-- /.sidebar-collapse -->
</div>
此代码存在于我的页眉中并在我的页脚中添加了所有 js
<!-- jQuery -->
<script src="../bower_components/jquery/dist/jquery.min.js"></script>
<!-- Bootstrap Core JavaScript -->
<script src="../bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
<!-- Metis Menu Plugin JavaScript -->
<script src="../bower_components/metisMenu/dist/metisMenu.min.js"></script>
<!-- Morris Charts JavaScript -->
<script src="../bower_components/raphael/raphael-min.js"></script>
<script src="../bower_components/morrisjs/morris.min.js"></script>
<script src="../js/morris-data.js"></script>
<!-- Custom Theme JavaScript -->
<script src="../dist/js/sb-admin-2.js"></script>
将collapse课程添加到您的第二级
<ul class="nav nav-second-level collapse">
PS 看起来您使用的是 SBAdmin V2 而不是 V1，应该指定。此外，我建议尝试从他们的演示页面复制/粘贴并根据自己的喜好进行修改。
SBAdminV2 Github 页面（来源、文档和帮助！:)）
编辑似乎可以很好地使用他们的确切代码。
<link href="https://blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="https://blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/metisMenu/metisMenu.min.css" rel="stylesheet">
<link href="https://blackrockdigital.github.io/startbootstrap-sb-admin-2/dist/css/sb-admin-2.css" rel="stylesheet">
<link href="https://blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/morrisjs/morris.css" rel="stylesheet">
<link href="https://blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<body>
<div id="wrapper">
<!-- Navigation -->
<nav class="navbar navbar-default navbar-static-top" role="navigation" style="margin-bottom: 0">
<!-- /.navbar-header -->
<!-- /.navbar-top-links -->
<div class="navbar-default sidebar" role="navigation">
<div class="sidebar-nav navbar-collapse">
<ul class="nav in" id="side-menu">
<li class="sidebar-search">
<div class="input-group custom-search-form">
<input type="text" class="form-control" placeholder="Search...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
<!-- /input-group -->
</li>
<li>
<a href="index.html" class="active"><i class="fa fa-dashboard fa-fw"></i> Dashboard</a>
</li>
<li>
<a href="#"><i class="fa fa-bar-chart-o fa-fw"></i> Charts<span class="fa arrow"></span></a>
<ul class="nav nav-second-level collapse">
<li>
<a href="flot.html">Flot Charts</a>
</li>
<li>
<a href="morris.html">Morris.js Charts</a>
</li>
</ul>
<!-- /.nav-second-level -->
</li>
<li>
<a href="tables.html"><i class="fa fa-table fa-fw"></i> Tables</a>
</li>
<li>
<a href="forms.html"><i class="fa fa-edit fa-fw"></i> Forms</a>
</li>
<li>
<a href="#"><i class="fa fa-wrench fa-fw"></i> UI Elements<span class="fa arrow"></span></a>
<ul class="nav nav-second-level collapse">
<li>
<a href="panels-wells.html">Panels and Wells</a>
</li>
<li>
<a href="buttons.html">Buttons</a>
</li>
<li>
<a href="notifications.html">Notifications</a>
</li>
<li>
<a href="typography.html">Typography</a>
</li>
<li>
<a href="icons.html"> Icons</a>
</li>
<li>
<a href="grid.html">Grid</a>
</li>
</ul>
<!-- /.nav-second-level -->
</li>
<li>
<a href="#"><i class="fa fa-sitemap fa-fw"></i> Multi-Level Dropdown<span class="fa arrow"></span></a>
<ul class="nav nav-second-level collapse">
<li>
<a href="#">Second Level Item</a>
</li>
<li>
<a href="#">Second Level Item</a>
</li>
<li>
<a href="#">Third Level <span class="fa arrow"></span></a>
<ul class="nav nav-third-level collapse">
<li>
<a href="#">Third Level Item</a>
</li>
<li>
<a href="#">Third Level Item</a>
</li>
<li>
<a href="#">Third Level Item</a>
</li>
<li>
<a href="#">Third Level Item</a>
</li>
</ul>
<!-- /.nav-third-level -->
</li>
</ul>
<!-- /.nav-second-level -->
</li>
<li>
<a href="#"><i class="fa fa-files-o fa-fw"></i> Sample Pages<span class="fa arrow"></span></a>
<ul class="nav nav-second-level collapse">
<li>
<a href="blank.html">Blank Page</a>
</li>
<li>
<a href="login.html">Login Page</a>
</li>
</ul>
<!-- /.nav-second-level -->
</li>
</ul>
</div>
<!-- /.sidebar-collapse -->
</div>
<!-- /.navbar-static-side -->
</nav>
<!-- /#page-wrapper -->
</div>
<script src="//blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/jquery/jquery.min.js"></script>
<script src="//blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/bootstrap/js/bootstrap.min.js"></script>
<script src="//blackrockdigital.github.io/startbootstrap-sb-admin-2/vendor/metisMenu/metisMenu.min.js"></script>
<script src="//blackrockdigital.github.io/startbootstrap-sb-admin-2/dist/js/sb-admin-2.js"></script>
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我来说两句