鼠标滚轮事件

 1 function mousewheel (e) {
 2 　　var e = e || window.event;
 3 　　e.delta = e.wheelDelta ? e.wheelDelta / 120 : - (e.delta || 0) / 3;
 4 if (e.delta === -1) {
 5 console.log("向下滚");
 6 } else if (e.delta === 1) {
 7 console.log("向上滚");
 8 }
 9 　　e.stopPropagation();
10 e.preventDefault();
11 }
12 window.addEventListener(‘DOMMouseScroll‘, mousewheel);
13 window.addEventListener(‘mousewheel‘, mousewheel);