我无法弄清楚为什么我的下拉菜单没有在引导程序中下拉。有人可以指出我的错误吗?
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<!-- Bootstrap -->
<link href="css/bootstrap.css" rel="stylesheet" media="screen" />
</head>
<body>
<div class="row-fluid">
<div class="span12">
<div class="navbar">
<div class="navbar-inner">
<a class="brand" href="#">Prodata</a>
<ul class="nav">
<li class="dropdown">
<a data-target="#" href="#" class="dropdown-toggle" data-toggle="dropdown" id="manageLabel">Manage<b class="caret"></b></a>
<ul class="dropdown-menu" role="menu" aria-labelledby="manageLabel">
<li><a href="#">Companies</a></li>
<li><a href="#">Surveys</a></li>
<li><a href="#">Job Numbers</a></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
<script src="http://code.jquery.com/jquery-2.0.3.min.js" />
<script src="js/bootstrap.min.js" />
</body>
</html>