我希望如果我更改為移動視圖，選單項將折疊，當我單擊它時，它會在下拉選單中顯示選單。這段代碼好像不行，怎么回事？
我想單擊此圖示并在下拉選單中顯示選單項。檢查此影像 移動視圖
這就是它在桌面視圖中的樣子桌面視圖
在 HTML 中：
<nav class="navbar navbar-expand-md navbar-dark bg-dark">
<div class="container-fluid">
<a class="navbar-brand" href="#">Admin Panel</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse justify-content-end mr-5" id="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<div class="btn-group m-1">
<li class="nav-item">
<a class="nav-link btn btn-success active m-1" aria-current="page" href="home.php">View Event</a>
</li>
<li class="nav-item">
<a class="nav-link btn btn-primary m-1" href="add_event.php">Add Event</a>
</li>
<li class="nav-item dropdown">
<div class="btn-group m-1">
<button type="button" class="btn btn-primary dropdown-toggle" id="navbarDropdown" data-toggle="dropdown">
User
</button>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="userFeedback.php">Feedback</a>
<a class="dropdown-item" href="userProblem.php">Issues</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" onclick="logoutChecker()" href="index.php">Logout</a>
</div>
</div>
</li>
</div>
</ul>
</div>
</div>
然后是腳本：
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js">
</script>
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
uj5u.com熱心網友回復：
嘿，您的按鈕中有一些額外的文字
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent">
而不是使用data-bs-toggle="collapse"，data-bs-target="#navbarSupportedContent"您必須在使用 bootstrap 4 時使用data-toggle="collapse"并 data-target="#navbarsExample01"取出bs以獲取更多資訊，您可以查看Bootstrap官方網站中的 de Docs。
也不要忘記在nav代碼末尾關閉標簽
uj5u.com熱心網友回復：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark bg-dark">
<div class="container-fluid">
<a class="navbar-brand" href="#">Admin Panel</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse justify-content-end mr-5" id="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<div class="btn-group m-1">
<li class="nav-item">
<a class="nav-link btn btn-success active m-1" aria-current="page" href="home.php">View Event</a>
</li>
<li class="nav-item">
<a class="nav-link btn btn-primary m-1" href="add_event.php">Add Event</a>
</li>
<li class="nav-item dropdown">
<div class="btn-group m-1">
<button type="button" class="btn btn-primary dropdown-toggle" id="navbarDropdown" data-toggle="dropdown">
User
</button>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="userFeedback.php">Feedback</a>
<a class="dropdown-item" href="userProblem.php">Issues</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" onclick="logoutChecker()" href="index.php">Logout</a>
</div>
</div>
</li>
</div>
</ul>
</div>
</div>
</nav>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js">
</script>
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
</body>
</html>將此代碼用于導航欄切換按鈕
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
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