                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JS動畫效果

瀏覽器沒有報錯，可是沒有實現像老師的功能，我找了好久也沒找出錯誤，哪位兄弟可以幫我看一下

<!DOCTYPE?html>
<html>
<head>
<meta?charset="UTF-8">
<title>多物體運動</title>
<style?type="text/css">
*{
padding:?0;
margin:?0;
}
ul,li?{
list-style:?none;
}
ul?li?{
width:?200px;
height:?100px;
background:?yellow;
margin-bottom:?20px;
}
</style>
<script?type="text/javascript">
window.onload=function(){
var?aLi=document.getElementsByTagName('li');
for(var?i=0;i>aLi.length;i++){
aLi[i].timer=null
aLi[i].onmouseover=function(){
startMove(this,400);
}
aLi[i].onmouseout=function(){
startMove(this,200);
}
}
}
//var?timer=null;
function?startMove(obj,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var?speed=(iTarget-obj.offsetWidth)/8;
speed=speed?>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth==iTarget){
clearInterval(obj.timer);
}else{
obj.style.width=obj.offsetWidth+speed+'px';
}
},30)
}
</script>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
??</ul>
</body>
</html>