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這是我的代碼。請告訴我哪裏是在代碼中的錯誤：bootstrap導航欄切換不折疊
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html
xmlns="http://www.w3.org/1999/xhtml"> <head> <meta
http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Marbles & Marbles</title> <link rel="stylesheet"
type="text/css" href="bootstrap/css/bootstrap.min.css"/> <script
type="text/javascript" src="bootstrap/js/bootstrap.min.js"></script>
<script type="text/javascript" src="jquery/jquery-2.1.4.js"></script>
<script src="bxslider-4-master/dist/jquery.bxslider.min.js"></script>
<link rel="stylesheet" type="text/css" href="slider/engine1/style.css"
/> </head> <body> <nav class="navbar navbar-inverse"> <div
class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"
aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Marbles & Marbles</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">About Us</a></li>
<li><a href="#">Contact Us</a></li>
</ul>
</div>
</div>
</nav>
</body> </html>