JSFiddle - React, Tailwind, and code Playground

by f0t0n

HTML

<input type="checkbox" name="cb" id="cb">

JavaScript

function calculate(x, y) {
    var z = x + y;
    alert(z);
}

var a = 12,
    b = 13,
    element = document.getElementById('cb');

element.onchange = function(e) {
    calculate(a, b);
};