scrollTop compatitable way

scrollTop-Compatitable

function getScrollTop(){
            var position = [0, 0];
            if (typeof window.pageYOffset != 'undefined') {
                position = [
                window.pageXOffset, window.pageYOffset];
            } else if (typeof document.documentElement.scrollTop != 'undefined' && document.documentElement.scrollTop > 0) {
                position = [
                document.documentElement.scrollLeft, document.documentElement.scrollTop];
            } else if (typeof document.body.scrollTop != 'undefined') {
                position = [
                document.body.scrollLeft, document.body.scrollTop];
            }
            return position;
}