如何使用bootstrap在手风琴中制作下载列表

我正在尝试创建一个有下拉列表的手风琴，但问题是我的下拉列表没有显示任何可供选择的列表，需要一些帮助。下面是我尝试过的逻辑，但没有成功。

<!-- Card body -->
<div class="accordion md-accordion" id="accordionEx" role="tablist" aria-multiselectable="true">
<!-- Accordion card -->
<div class="card">
<!-- Card header -->
<div class="card-header" role="tab" id="headingOne1">
<a data-toggle="collapse" data-parent="#accordionEx" href="#collapseOne1" aria-expanded="true"
aria-controls="collapseOne1">
<h5 class="mb-0">
This is a Sample Module <i class="fas fa-angle-down rotate-icon"></i>
</h5>
</a>
</div>
<!-- Card body -->
<div id="collapseOne1" class="collapse show" role="tabpanel" aria-labelledby="headingOne1"
data-parent="#accordionEx">
<div class="card-body">
<div class="dropdown">
<!--Trigger-->
<a type="button" id="dropdownMenu2" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><i class="fas fa-ellipsis-v"></i></a>

<!--Menu-->
<div class="dropdown-menu dropdown-primary">
<a class="dropdown-item" href="#"><i class="media"></i>&nbsp;&nbsp;Media</a>

</div>
</div>
</div>
</div>

很抱歉忽略了您的代码，但我从Bootstrap网站合并了Collapse和Dropdown代码，它正在运行，我认为这就是您想要实现的。

你可能把引导程序类搞砸了。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Test</title>
<style>
</style>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"
integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
</head>
<body>
<div id="accordion">
<div class="card">
<div class="card-header" id="headingOne">
<h5 class="mb-0">
<button class="btn btn-link" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true"
aria-controls="collapseOne">
Collapsible Group Item #1
</button>
</h5>
</div>
<div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordion">
<div class="card-body">
<div class="dropdown show">
<a class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink"
data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown link
</a>
<div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
</div>
</div>
</div>
<div class="card">
<div class="card-header" id="headingTwo">
<h5 class="mb-0">
<button class="btn btn-link collapsed" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false"
aria-controls="collapseTwo">
Collapsible Group Item #2
</button>
</h5>
</div>
<div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordion">
<div class="card-body">
Content 2
</div>
</div>
</div>
<div class="card">
<div class="card-header" id="headingThree">
<h5 class="mb-0">
<button class="btn btn-link collapsed" data-toggle="collapse" data-target="#collapseThree"
aria-expanded="false" aria-controls="collapseThree">
Collapsible Group Item #3
</button>
</h5>
</div>
<div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordion">
<div class="card-body">
Content 3
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"
integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN"
crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"
integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV"
crossorigin="anonymous"></script>
</body>
</html>

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