JSFiddle - React, Tailwind, and code Playground

by Hiren_Mangukiya

HTML

<button onClick="addCommas">click here</button>

JavaScript

function addCommas()
{
    nStr += '98765432154698745123986451';
    x = nStr.split('.');
    x1 = x[0];
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1 + x2;
}