bootstrap mobile collapse nav funktioniert nicht

Question

Hier ist mein Markup, ich folgte den Bootstrap-Dokumenten genau, aber ich habe keine Ahnung, warum das Menü nicht zusammenbricht. Jede Hilfe ist willkommen

<!-- Navigation --> 
<nav class="navbar navbar-default navbar-custom navbar-fixed-top" role="navigation"> 
    <div class="container-fluid"> 

<!-- 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="index.html"><img src="#" alt="Lundan On The Beat Logo"></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 navbar-right"> 
     <li class="nav-item"><a href="#home" class="active">Home</a></li> 
     <li class="nav-item"><a href="#services">Services</a></li> 
     <li class="nav-item"><a href="#gallery">Gallery</a></li> 
     <li class="nav-item"><a href="#contact">Contact</a></li> 
    </ul> 
</div> 

Answer 1

bereits. Jsfiddle: https://jsfiddle.net/DTcHh/20842/

<nav class="navbar navbar-default"> 
    <div class="container-fluid"> 
    <!-- 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="index.html"><img src="#" alt="Lundan On The Beat Logo"></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 navbar-right"> 
     <li class="nav-item"><a href="#home" class="active">Home</a></li> 
     <li class="nav-item"><a href="#services">Services</a></li> 
     <li class="nav-item"><a href="#gallery">Gallery</a></li> 
     <li class="nav-item"><a href="#contact">Contact</a></li> 
     </ul> 
    </div><!-- /.navbar-collapse --> 
    </div><!-- /.container-fluid --> 
</nav>