[jquery] 스마트폰 스크롤 감지

	let ts;
    $('#scroll_event').bind('touchstart', function(e){
      e.stopPropagation();
      ts = e.originalEvent.touches[0].clientY;
    });
    
    $('#scroll_event').bind('touchend', function(e){
        e.stopPropagation();
        var te = e. originalEvent.changedTouches[0].clientY;
        if(ts > te + 5){
        //스크롤 내릴때
        } else if(ts < te - 5){
        //스크롤 올릴때            
        }
    });