原理：window/document对象的mousewheel事件
var scrollFunc = function (e) {
var direct = 0;
e = e || window.event;
if (e.wheelDelta) {
//判断浏览器IE，谷歌滑轮事件
if (e.wheelDelta > 0) { //当滑轮向上滚动时
console.log("滑轮向上滚动");
}
if (e.wheelDelta < 0) { //当滑轮向下滚动时
console.log("滑轮向下滚动"); }
}
else if (e.detail) { //Firefox滑轮事件
if (e.detail> 0) { //当滑轮向上滚动时
console.log("滑轮向上滚动"); }
if (e.detail< 0) { //当滑轮向下滚动时
console.log("滑轮向下滚动"); }
}
};
//给页面绑定滑轮滚动事件if (document.addEventListener) {
document.addEventListener('DOMMouseScroll', scrollFunc, false);
}
//滚动滑轮触发scrollFunc方法
window.onmousewheel = document.onmousewheel = scrollFunc;
