【HELP】work on jsfiddle, but not playground

Question

the code I have in public called 'all indexof' work on jsfiddle, and i have included jquery in the cide, but somehow it told me $ is not defined, plz help

Answer 1

Try to use
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
instead

Answer 2

Could you share your Code Playground code.

Answer 3

You cant include same jQuery library for multiple times, just include one only.