js thousand separator and change td content

js thousand seprator and change TD content
 
// integer
function addCommas(n){
    var rx=  /(\d+)(\d{})/;
    return String(n).replace(/^\d+/, function(w){
        while(rx.test(w)){
            w= w.replace(rx, '$1,$2');
        }
        return w;
    });
}
 
//decimal
function thousandBitSeparator(num) {
        return num && num
            .toString()
            .replace(/(\d)(?=(\d{})+\.)/g, function($, $) {
                return $ + ",";
            });
}
 
// change table td content by getElementsByClassName()
 
function changeTDcontent(){
    var olist=document.getElementsByClassName("cl_id");
    for(var i=;i<olist.length;i++){
        var c=olist[i].innerHTML;
        olist[i].innerHTML=addCommas(c);
    }
}