JSFiddle - React, Tailwind, and code Playground

HTML

<button type='button' onclick='troca(this)' value='1'>Clica - me</button>
<button type='button' onclick='troca(this)' value='2'>Clica - me</button>
<button type='button' onclick='troca(this)' value='3'>Clica - me</button>

JavaScript

function troca(btn) {
    alert('BotĂŁo nr: ' + btn.value);
}