请问大佬哪儿错了啊？？？
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>多物体运动</title>
<style type="text/css">
*{
padding:0;
margin:0;
}
ul,li{
list-style: none;
}
ul li{
width:200px;
height:100px;
background-color: chartreuse;
margin-bottom:20px;
}
</style>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<script>
window.onload = function(){
var aLi=document.getElementsByName('li');
for(i=0;i<aLi.length;i++){
aLi[i].onmouseover= function(){
starMove(this,400);
}
aLi[i].onmouseout= function(){
starMove(this,200);
}
}
var timer = null;
function starMove(obj,target){
clearInterval(obj.timer);
timer = setInterval(function(){
var speed=(target-obj.offsetWidth)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth== target){
clearInterval(timer);
}else{
obj.style.width=obj.offsetWidth+speed+'px';
}
},30)
}
}
</script>
</body>
</html>?
