$(function(){
            $('.js_banner').slick({
                fade : false,
                infinite : true,
                arrows : true,
                autoplaySpeed : 3500,
                speed : 2000,
                autoplay : true,
                dots : true,
                dotsClass: 'slide-dots',
                lazyLoad: 'ondemand',
                pauseOnFocus: false,
                pauseOnHover: false,
                prevArrow: '<i class="prev over"></i>',
                nextArrow: '<i class="next over"></i>',
                customPaging: function(slick, index){
                    var num = slick.$slides.eq(index);
                    return '';
                }
            });
        });