Javascript Number comma()

// Add a comma every 3 digits, e.g. turn 11386040 into 11,386,040
var d3 = /(\d+)(\d{3})/;
Number.prototype.comma = function() {
    var s = this.toString();
    while (d3.test(s)) s = s.replace(d3, '$1,$2');
    return s;/*  w  w w  .  ja va 2  s  .  co m*/
};