javascript - Nav menu won't open or close on click -


i've been trying make hamburger menu work longest time , i've tried lot, keep going in circles reason menu won't open( menu not opening problem :( ),

i got menu learning how create tutorial -> youtube link

please let me know how fix or refer me similar post, thanks! 

$(document).ready(function() {    $(".burger-nav").on("click", function() {      $("header nav ul").toggleclass("open");    });    });
header nav ul {    height: 0;    overflow: hidden;    background: #6134a3;  }    header nav ul.open {    height: auto;  }    .burger-nav {    padding: 0px;    margin: 0px;    display: block;    height: 40px;    width: 100%;    cursor: pointer;    background-image: url(images/nav.png);    background-repeat: no-repeat;    background-size: 10%;    background-position: 97%;    background-color: #502196;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <head>    <title>menu</title>    <link rel="stylesheet" href="slicknav.css" />    <script language="javascript" type="text/javascript" scr="http://code.jquery.com/jquery-1.11.3.min.js"></script>  </head>    <style>    </style>    <body>    <header>      <div class="wrapper">        <nav>          <a class="burger-nav"></a>          <ul>            <li><a href="#">item 1</a></li>            <li><a href="#">item 2</a></li>            <li><a href="#">item 3</a></li>            <li><a href="#">item 4</a></li>          </ul>        </nav>      </div>    </header>    <!--watch video finish drop down https://www.youtube.com/watch?v=fdh7mdl2oww -->        <script language="javascript" type="text/javascript" scr="menu.js"></script>  </body>

use latest version of jquery.... 

<head>   <title>menu</title>   <link rel="stylesheet" href="slicknav.css" />   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> </head>

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