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Why is my JavaScript not working in sublime text

Using sublime text 3, javascript won't work in browsers, to work my hamburger/toggle menu. script5009 error occurs $ not defined

<!DOCTYPE html>
<html>
<head>
    <title>Title</title>
  <link rel="stylesheet" type="text/css" href="CSS/style.CSS">
  <script src="https://code.jquery.com/jquery-3.3.1.js"></script>
  <script src="/JS/stuff.js"></script>

 </head>
 <body>
    <header>
 <div class="container">

  <h1 class="Logo"><img src="images/image.png"></h1>

  <nav class="site-nav">
      <ul>
        <li><a href="">Home</a></li>
        <li><a href="">About us</a></li>
        <li><a href="">staff</a></li>
        <li><a href="">Contact</a></li>
      </ul>
   </nav>

  <div class="menu-toggle">
    <div class="hamburger"></div>
  </div>

</div>

</header>
</body>
</html>

Your problem is that you don't have the jQuery script. Add this tag to the top of the file:

<script src="https://code.jquery.com/jquery-3.3.1.js"></script>

And it will work.

EDIT:

Add this code to your HTML to toggle the hamburger:

$(".menu-toggle").on("click", () => {
    $(".hamburger").toggle();
});

And it'll work.

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