javascript - Bootstrap collapse hiding navigation links on load -


i working on project using bootstrap , in starting fixed navigation on top have found hiding links (ie. home, account, logoff), presumably collapsing them. because when shrink down , toggle display them after initiate it. when remove .collapse below first comment displays links. not collapse on resizing. how top nav links show , still have toggle work? note: of file paths css , js correct directories

<!doctype html> <html>       <head>     <title>project</title>     <meta name="viewport" content="width=device-width, initial-scale=1.0">     <link href="css/bootstrap.min.css" rel="stylesheet" media="screen">   </head>   <body>     <nav class="navbar navbar-default" role="navigation">       <div class="navbar-header">     <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">       <span class="icon-bar"></span>       <span class="icon-bar"></span>       <span class="icon-bar"></span>     </button>     <a class="navbar-brand" href="#">brand</a>       </div>        <!-- problem here -->       <div class="collapse navbar-collapse navbar-ex1-collapse">         <ul class="nav navbar-nav">           <li class="active"><a href="#">home</a></li>           <li><a href="#">account</a></li>       <li><a href="#">logout</a></li>     </ul>       </div><!-- /.navbar-collapse -->     </nav>     <h1>hello, world!</h1>     <script src="js/jquery.js"></script>     <script src="js/bootstrap.min.js"></script>   </body> </html> 

turns out because trying combine js , css both bootstrap 2 , 3. once got on same playing field works fine.