JSFiddle - React, Tailwind, and code Playground

HTML

<button>0</button>
<button>1</button>

JavaScript

var buttons = document.getElementsByTagName('button');
for (var i = 0; i < buttons.length; i++) {
    (function (i) {
        buttons[i].onclick = function () {
            alert("button " + i + " was clicked");
        }
    }(i));
}