$.fn.scrollUnique = function() {
return $(this).each(function() {
var eventType = ‘mousewheel’;
$(this).on(eventType, function(event) {
var scrollTop = this.scrollTop,
scrollHeight = this.scrollHeight,
height = this.clientHeight;
var delta = (event.originalEvent.wheelDelta) ? event.originalEvent.wheelDelta : -(event.originalEvent.detail || 0);
if ((delta > 0 && scrollTop <= delta) || (delta < 0 && scrollHeight – height – scrollTop <= -1 * delta)) {
// IE浏览器下滚动会跨越边界直接影响父级滚动，因此，临界时候手动边界滚动定位
this.scrollTop = delta > 0? 0: scrollHeight;
// 向上滚 || 向下滚
event.preventDefault();
}
});
});
};