var slider = $(".slider-item");
var scrollCount = null;
var scroll= null;
slider
.slick({
dots: true
});
slider.on('wheel', (function(e) {
e.preventDefault();
clearTimeout(scroll);
scroll = setTimeout(function(){scrollCount=0;}, 200);
if(scrollCount) return 0;
scrollCount=1;
if (e.originalEvent.deltaY < 0) {
$(this).slick('slickNext');
} else {
$(this).slick('slickPrev');
}
}));