引導下拉不下降

我不明白爲什麼這個下拉不下降在引導。有人能指出我的錯誤嗎？引導下拉不下降

<?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>

來源

2013-10-11 functionalCode

引導下拉不下降

回答

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