JSFiddle - React, Tailwind, and code Playground

HTML

<ul class=events>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
</ul>
<ul class=events>
    <li>1</li>
    <li>2</li>
    <li>3</li>
</ul>

JavaScript

$("ul li").on('click', function(){
    var x = $("ul li").index(this);
    alert(x);
});