javascript - bootstrap navbar doesn't toggle -

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when try mobile version of jumbotron-based page, navbar doesn't toggle. want fold out in the example doesn't. maybe i'm missing code, can me make work? screenshot how supposed when navbar folds out in [the example.

enter image description here

this my page, based on jumbotron navbar foldout doesn't work when press button upper right, doesn't toggle.

enter image description here

my code (identical example). 

<nav class="navbar navbar-inverse navbar-fixed-top">     <div class="container">         <div class="navbar-header">             <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar"                     aria-expanded="false" aria-controls="navbar">                 <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="/">customer service</a>         </div>         <div id="navbar" class="navbar-collapse collapse">             <form class="navbar-form navbar-right" action="/account/do_login" method="post">                 <div class="form-group">                     <input type="text" name="email" placeholder="email" class="form-control">                 </div>                 <div class="form-group">                     <input type="password" name="password" placeholder="password" class="form-control">                 </div>                 <button type="submit" class="btn btn-success">sign in</button>             </form>         </div>         <!--/.navbar-collapse -->     </div> </nav>

please try check bootstrap.min.js or bootstrap.js. may not loading properly.


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