Uncaught ReferenceError: jQuery is not defined js code example

Example 1: jquery $ is not defined

<!--If that error occurs, you need to include Jquery in the HTML-->
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

Example 2: reference error $ is not defined jquery

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

Example 3: Uncaught ReferenceError: $ is not defined

You should put the references to the jquery scripts first.
<script src="jquery-3.5.1.js"></script>
<script type="text/javascript" src="script.js"></script>