Place commas in Javascript integers

Question

So I have a value in Javascript:

var val = Entry.val;

One example of this value is 277385. How do I, in Javascript, convert th

Answer 1

I'm not sure why the other answers split the number on a decimal point- you can replace, starting with a digit,until there are no more digits. It will quit when it runs out of digits or hits a non-digit.

function addCommas(n){
    var rx= /(\d+)(\d{3})/;
    return String(n).replace(/^\d+/, function(w){
        while(rx.test(w)) w= w.replace(rx,'$1,$2');
        return w;
    });
}