Аналог php функции number_format на javascript

 function number_format (number, decimals, decPoint, thousandsSep) {
    number = (number + '').replace(/[^0-9+\-Ee.]/g, '')
    var n = !isFinite(+number) ? 0 : +number
    var prec = !isFinite(+decimals) ? 0 : Math.abs(decimals)
    var sep = (typeof thousandsSep === 'undefined') ? ',' : thousandsSep
    var dec = (typeof decPoint === 'undefined') ? '.' : decPoint
    var s = ''

    var toFixedFix = function (n, prec) {
        var k = Math.pow(10, prec)
        return '' + (Math.round(n * k) / k)
        .toFixed(prec)
    }

    s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.')
    if (s[0].length > 3) {
        s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep)
    }
    if ((s[1] || '').length < prec) {
        s[1] = s[1] || ''
        s[1] += new Array(prec - s[1].length + 1).join('0')
    }
    return s.join(dec)
}