(function ($) {     var types = ['DOMMouseScroll', 'mousewheel'];     $.event.special.mousewheel = {         setup: function () {             if (this.addEventListener) {                 for (var i = types.length; i;) {                     this.addEventListener(types[--i], handler, false);                 }             } else {                 this.onmousewheel = handler;             }         },         teardown: function () {             if (this.removeEventListener) {                 for (var i = types.length; i;) {                     this.removeEventListener(types[--i], handler, false);                 }             } else {                 this.onmousewheel = null;             }         }     };     $.fn.extend({         mousewheel: function (fn) {             return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");         },         unmousewheel: function (fn) {             return this.unbind("mousewheel", fn);         }     });     function handler(event) {         var orgEvent = event || window.event, args = [].slice.call(arguments, 1), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;         event = $.event.fix(orgEvent);         event.type = "mousewheel";         // Old school scrollwheel delta         if (event.originalEvent.wheelDelta) { delta = event.originalEvent.wheelDelta / 120; }         if (event.originalEvent.detail) { delta = -event.originalEvent.detail / 3; }         // New school multidimensional scroll (touchpads) deltas         deltaY = delta;         // Gecko         if (orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS) {             deltaY = 0;             deltaX = -1 * delta;         }         // Webkit         if (orgEvent.wheelDeltaY !== undefined) { deltaY = orgEvent.wheelDeltaY / 120; }         if (orgEvent.wheelDeltaX !== undefined) { deltaX = -1 * orgEvent.wheelDeltaX / 120; }         // Add event and delta to the front of the arguments         args.unshift(event, delta, deltaX, deltaY);         return $.event.handle.apply(this, args);     } })(jQuery); 调用: $(document).mousewheel(function (e, detail) { }