JSFiddle - React, Tailwind, and code Playground

HTML

<span id = 'textSpan'></span>

JavaScript

var num = "123456789";
var result = "";

while (num.length > 0)
{
 	result = result + " " + num.substring(0,3);
    num = num.substring(3);
}

$("#textSpan").text(result);