window.onload = function () {
//接着利用我们自己封装的函数给div绑定事件,
var oDiv = document.getElementById('div1');
addEvent(oDiv,'mousewheel',onMouseWheel);
addEvent(oDiv,'DOMMouseScroll',onMouseWheel);
// 当滚轮事件发生时,执行onMouseWheel这个函数
function onMouseWheel() {
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; //scrollTop就是触发滚轮事件时滚轮的高度});
}
}