鼠标滚轮动画

function wheelFun(element,up,down){

element.onmousewheel = fn;

if (window.addEventListener) {

element.addEventListener("DOMMouseScroll",fn, false);

}

function fn(event){

var event = event || window.event;

if (event.wheelDelta > 0 || event.detail < 0) {

up();

} else{

down();

}

}

}

wheelFun(document,function(){

console.log(1);

},function(){

console.log(2);

});