How to format number in javascript jquery

Today we will figure out how to format a number utilizing JavaScript or jQuery. I was taking a shot at a report when I need the add up to be formatted and after some seeking on web I discovered some plugins however I would prefer not to use plugin on my website for such a little errand. At long last I've discovered strategy which works for me so I've chosen to compose a post to impart these little strategies to every one of you. Here I am sharing two strategies so it's your decision to use anybody of them which is appropriate for you.

Function 1 :-
//-----------------Apply comma formation on Amount using JavaScript ------------------

function CommaFormatted(amount) {
            var delimiter = ","; // replace comma if desired
            var a = amount.split('.', 2)
            var d = a[1];
            var i = parseInt(a[0]);
            if (isNaN(i)) { return ''; }
            var minus = '';
            if (i < 0) { minus = '-'; }
            i = Math.abs(i);
            var n = new String(i);
            var a = [];
            while (n.length > 3) {
                var nn = n.substr(n.length - 3);
                a.unshift(nn);
                n = n.substr(0, n.length - 3);
            }
            if (n.length > 0) { a.unshift(n); }
            n = a.join(delimiter);
            if (d.length < 1) { amount = n; }
            else { amount = n + '.' + d; }
            amount = minus + amount;
            return amount;
        }

Function 2:-
 This Function take string as parameter and by using jQuery .test() function and regular expression we are adding comma to the amount.i.e. 2000 will become 2,000

function addCommas(nStr) {
            nStr += '';
            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;
        }