JSFiddle - React, Tailwind, and code Playground

HTML

<p class="points">10999</p>
<p class="points">75458.000000</p>
<p class="points">54545.12345</p>
<p class="points">54545.</p>
<p class="points">55454</p>

JavaScript

function numberWithCommas(num) {
    var x = num.toString();
    var tail = "";
    if (x.indexOf(".") >= 0) {
        tail = x.substring(x.indexOf("."));
        x = x.substring(0, x.indexOf("."));
    }
    return x.replace(/\B(?=(?:\d{3})+(?!\d))/g, ",") + tail;
}


    $('.points').each(function(){
    var v_pound = $(this).html();
    v_pound = numberWithCommas(v_pound);

    $(this).html(v_pound)
        
        })