my toggle button navgar not responding : When I click in the small size toggle button it doesn't work and doesn't respond.  What seems to be the problem here could anyone tell me please? i try some solution ,its not working with me, here is the full code

    <html>
    
    <head>
        <link rel="stylesheet" href="bootstrap-4.0.0-alpha.6-dist/css/bootstrap.min.css" type="text/css">
    
    
    
    </head>
    
    <body style="background-color:darkslategrey">
        <!--navbar-->
        <nav class="navbar navbar-toggleable navbar-light bg-faded">
            <!--intro navbar-->
            <button type="button"
             class="navbar-toggler navbar-toggler-icon navbar-toggler-right collapsed"
               data-toggle="collapse"
                data-target="#menu"><!--responsive collapse menu--></button>
            <span class="navbar-brand-icon">Bootstrap</span>
            <!--navbar logo-->
    
            <div class="collapse navbar-collapse" id="menu">
                <!--in the item-->
                <ul class="nav navbar-nav">
                    <li class="nav-item active"><a href="" class="nav-link">Home</a></li>
                    <li class="nav-item"><a href="" class="nav-link">About us</a></li>
                    <li class="nav-item"><a href="" class="nav-link">Services</a></li>
    
                </ul>
            </div>
    
        </nav>
    
    
    
    
    
    
    
        <!--header-->
        <div class="container">
            <div clss="header-page">
                <div class="lead">
                    <h1>Welcome in Helper Classes</h1>
    
                </div>
                <hr>
                <script src="bootstrap-4.0.0-alpha.6-dist/js/bootstrap.min.js" type="text/javascript"></script>
                <script src="jquery.js" type="text/javascript"></script>
    </body>
    
    </html>

