JSFiddle - React, Tailwind, and code Playground

HTML

<body>

<p>A new alert box will appear every 3 seconds.</p>

<p>This will go on forever, until you close the window.</p>

</body>

JavaScript

setInterval(function(){alert('Hello')},1000)

var timeOut = function() {
    alert('Hello');
};

var main = function() {
    setInterval(timeOut, 3000);
};

$(document).ready(main);