JSFiddle - React, Tailwind, and code Playground

HTML

<div id="log"></div>

JavaScript

var x = 1;

$(function () {
    function Test() {
        var x = 2;
        $('#log').append('<span>local: ' + x + '</span>');
        $('#log').append('<span>global: ' + window.x + '</span>');
    }
    Test();
});