为什么我做出来的效果会抽搐？
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
*{
padding: 0;
margin:0;
}
ul li{
width: 100px;
height: 100px;
background:green;
margin-bottom: 10px;
}
</style>
<script type="text/javascript">
var timer;
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,200);
}
ali[i].onmouseout=function(){
startMove(this,0);
}
}
}
function startMove(obj,iTarget){
clearInterval(obj.timer);
timer=setInterval(function(){
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';
}
},50);
}
</script>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>为什么我做出来的效果会抽搐？
要怎么改？
