我這個怎么實現不了導航條呢
<!doctype?html>
<html?lang="en">
<head>
????<meta?charset="utf-8">
????<meta?name="viewport"?content="width=device-width,?initial-scale=1">
????<link?rel="stylesheet"?href="css/bootstrap.min.css">
????<title>后臺管理系統</title>
</head>
<body>
????<nav?class="navbar?navbar-default?navbar-fixed-top?navbar-inverse"?role="navigation">
????????<div?class="container">
????????????<div?class="navbar-header">
????????????????<button?type="button"?class="navbar-toggle?collapsed"?data-toggle="collapse"?data-target="#bs-example-navbar-collapse-1">
????????????<span?class="sr-only">切換導航</span>
????????????<span?class="icon-bar"></span>
????????????<span?class="icon-bar"></span>
????????????<span?class="icon-bar"></span>
????????</button>
????????????????<a?class="navbar-brand"?href="#">首頁</a>
????????????</div>
????????????<div?class="collapse?navbar-collapse"?id="bs-example-navbar-collapse-1">
????????????????<ul?class="nav?navbar-nav">
????????????????????<li?class="active"><a?href="#">iOS</a></li>
????????????????????<li><a?href="#">SVN</a></li>
????????????????</ul>
????????????</div>
????????</div>
????</nav>
????<script?src="js/jquery-3.4.1.js"></script>
????<script?src="js/bootstrap.min.js"></script>
</body>
</html>
2020-10-20
你css。js文件放對了嗎？？？？？？？