引导程序navbar-static-top类
要创建随页面滚动的导航栏，请添加.navbar-static-top类。此类不需要将填充添加到<body>。
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<script src = "/scripts/jquery.min.js"></script>
<script src = "/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<nav class = "navbar navbar-default navbar-static-top" role = "navigation">
<div class = "navbar-header">
<a class = "navbar-brand" href = "#">Car Accessories</a>
</div>
<div>
<ul class = "nav navbar-nav">
<li class = "active"><a href = "#">Car Cover</a></li>
<li><a href = "#">Car Mobile Holder</a></li>
<li><a href = "#">Car Mobile Charger</a></li>
</ul>
</div>
</nav>
</body>
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