复制的提示的代码，怎么没效果，复制别人的就可以，自己跟着写又不行了。校对过了，没发现不一样。求大神
window.onload=function(){
var aA=document.getElementsByTagName('ul')[0];
for(var i=0; i<aA.length; i++){
aLi[i].onmouseover=function(){
var oSubNav=this.getElementsByTagName('ul')[0];
if(oSubNav){
var This=oSubNav;
clearInterval(This.time);
This.time=setInterval(function(){
This.style.height=This.offsetHeight+16+"px";
if(This.offsetHeight>=120)
clearInterval(This.time);
},30)
}
}
aLi[i].onmouseover=function(){
var oSubNav=this.getElementsByTagName('ul')[0];
if(oSubNav){
var This=oSubNav;
clearInterval(This.time);
This.time=setInterval(function(){
This.style.height=This.offsetHeight-16+"px";
if(This.offsetHeight<=0)
clearInterval(This.time);
},30)
}
}
}
}
