我在使用 Bootstrap 時遇到了一個小問題。每次我展開選單（漢堡圖示）時，它在我嘗試關閉后都不會折疊。您能否讓我知道我哪里出錯了以及我將來可以做些什么來避免這個問題，謝謝。
<body>
<nav id="mainNavBar" class="navbar navbar-expand-md navbar-dark bg-dark">
<a class="navbar-brand" href="#">CANDY</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navLinks"
aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navLinks">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" aria-current="page" href="#">HOME</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">ABOUT</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">TICKETS</a>
</li>
</ul>
</div>
</nav>`
</body>
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強調文本
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<nav id="mainNavBar" class="navbar navbar-expand-md navbar-dark bg-dark">
<a class="navbar-brand" href="#">CANDY</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navLinks"
aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navLinks">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" aria-current="page" href="#">HOME</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">ABOUT</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">TICKETS</a>
</li>
</ul>
</div>
</nav>
`
<!-- Optional JavaScript; choose one of the two! -->
<!-- Option 1: Bootstrap Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg OMhuP IlRH9sENBO0LRn5q 8nbTov4 1p" crossorigin="anonymous"></script>
<!-- Option 2: Separate Popper and Bootstrap JS -->
<!--
<script src="https://cdn.jsdelivr.net/npm/@popperjs/[email protected]/dist/umd/popper.min.js" integrity="sha384-7 zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG 2QOK9T ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
-->
</body>
</html>我試了一下，效果很好。確保您使用正確的引導程式版本。
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