JSFiddle - React, Tailwind, and code Playground

by Neal

HTML

<p id="demo">0</p>
<button type="button" id="the_button">Count</button>

JavaScript

window.onload = function () {
    var button = document.getElementById("the_button");
    button.onclick = count();

    function count() {
        var a = 0;
        var demo = document.getElementById("demo");
        return function () {
            demo.innerHTML = ++a;
        }
    }
}