JSFiddle - React, Tailwind, and code Playground

HTML

<ol>
    <li value="1">First</li>
    <li value="2">Second</li>
    <li value="4">Forth</li>
</ol>
<input id="addThird" type="button" value="Add Third" />

JavaScript

$(function() {
    $('#addThird').one('click', function() {
       $('ol').append('<li value="3">Third</li>');
    });
});