스크롤 위아래 구분 실행 함수

var prevScrollTop = $("#page-content-scroll").scrollTop(),
            nowScrollTop = $("#page-content-scroll").scrollTop(),
            nowDir = 'down',
            prevDir = 'down';
       
        $("#page-content-scroll").on('scroll touchmove', function () {
            nowScrollTop = $("#page-content-scroll").scrollTop();
            if (nowScrollTop > prevScrollTop) {
                nowDir = 'down';
                $("#shopRegister").slideUp();
            } else if (nowScrollTop < prevScrollTop) {
                nowDir = 'up';
                $("#shopRegister").show("slow");
            }
            console.log(nowScrollTop + " / " + prevScrollTop);
            if (nowDir != prevDir) {
                   
                if(nowDir == "down")
                {
                   $("#shopRegister").slideUp();
                }
                else
                {
                   $("#shopRegister").show("slow");
                }
               
            }
            prevDir = nowDir;
            prevScrollTop = nowScrollTop;

        });