JSFiddle - React, Tailwind, and code Playground

HTML

<button id="1" onclick="clickit()">click me</button>
<button id="2">click me</button>
<button id="3">click me</button>

JavaScript

var button1 = document.getElementById("1");
var button2 = document.getElementById("2");
var button3 = document.getElementById("3");

id = "0";

window.clickit = function(){
    console.log(this.id);
};


button2.onclick = clickit;
button3.addEventListener("click", clickit, false);