javaScript判断鼠标滚轮的上下滚动

 1 <script type="text/javascript">  
 2         var scrollFunc = function (e) {  
 3         e = e || window.event;  
 4         if (e.wheelDelta) {  //判断浏览器IE，谷歌滑轮事件               
 5             if (e.wheelDelta > 0) { //当滑轮向上滚动时  
 6                 alert("滑轮向上滚动");  
 7             }  
 8             if (e.wheelDelta < 0) { //当滑轮向下滚动时  
 9                 alert("滑轮向下滚动");  
10             }  
11         } else if (e.detail) {  //Firefox滑轮事件  
12             if (e.detail> 0) { //当滑轮向上滚动时  
13                 alert("滑轮向上滚动");  
14             }  
15             if (e.detail< 0) { //当滑轮向下滚动时  
16                 alert("滑轮向下滚动");  
17             }  
18         }  
19     }  
20     //给页面绑定滑轮滚动事件  
21     if (document.addEventListener) {//firefox  
22         document.addEventListener(‘DOMMouseScroll‘, scrollFunc, false);  
23     }  
24     //滚动滑轮触发scrollFunc方法  //ie 谷歌  
25     window.onmousewheel = document.onmousewheel = scrollFunc;   
26     </script>