鼠标上下滚轮事件

<script type="text/javascript" >
scrollFunc = function (event) {
event = event || window.event;
var fx = event.wheelDelta || -event.detail;
if (fx > 0) {
alert("你向上滚动了鼠标")
} else if (fx < 0) {
alert("你向下滚动了鼠标")
}
}
if (document.addEventListener) {
document.addEventListener('DOMMouseScroll', scrollFunc, false);
}
document.onmousewheel = scrollFunc;
</script>