鼠标滚轮事件（mousewheel、DOMMouseScroll）

 1 (function() {

 2     function handleMouseWheel(event) {

 3         event = EventUtil.getEvent(event);

 4         var delta = EventUtil.getWheelDelta(event);

 5         console.log(delta);

 6     }

 7 

 8     EventUtil.addHandler(document, "mousewheel", handleMouseWheel);

 9     EventUtil.addHandler(document, "DOMMouseScroll", handleMouseWheel);

10 })();