햄버거 버튼 클릭했는데 하단 메뉴가 안 보입니다 ㅠㅠ 원인이 뭘까요??
<html>
<head>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css">
<style>
.list-group-item {
color:blue;
display:none;
}
.show {
display:block;
}
</style>
</head>
<body>
<nav class="navbar navbar-light bg-light">
<div class="container-fluid">
<span class="navbar-brand">Navbar</span>
<button class="navbar-toggler" type="button">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</nav>
<ul class="list-group">
<li class="list-group-item">An item
<li class="list-group-item">A second item
<li class="list-group-item">A third item
<li class="list-group-item">A fourth item
<li class="list-group-item">And a fifth one
<script>
document.getElementsByClassName('navbar-toggler')[0].addEventListener('click', function(){
document.getElementsByClassName('list-group')[0].classList.toggle('show');
});
</script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js">
</body>
</html>
