JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li><a href="#" class="listElem">First</a></li>
  <li><a href="#" class="listElem">Second</a></li>
  <li><a href="#" class="listElem">Third</a></li>
</ul>

JavaScript

$(".listElem").click(function(param) {
  console.log($(this).index());
});