完美运动框架问题，鼠标放上去有效果，离开后透明度没有变回来
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{margin:0;padding:0;}
div{height:100px;width:100px;background-color:#F00;border:5px solid #63C;margin-top:2px;opacity:0.3;filter:Alpha(opacity:30);}
</style>
<script>
window.onload=function(){
var div1=document.getElementById("div1");
div1.onmouseover=function(){startMove(div1,{"width":"200","opacity":"100"})};
div1.onmouseout=function(){startMove(div1,{"opacity":"30","width":"100"})};
}
//完美运动框架
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr]
}
else{return getComputedStyle(obj,false)[attr];}
}
//startMove(obj,{attr1:target1,attr2:target2},fn)
function startMove(obj,json,fn){
clearInterval(obj.timer);
var flag;//标志所有运动是否达到目标值
obj.timer=setInterval(function(){
flag=true;//进入定时器时，现将flag设置为所有的属性值都已经达到目标值
for( var attr in json)
//取当前的值
{var icur=0;
if(attr=="opacity"){icur=Math.round(getStyle(obj,attr)*100)}else{icur=parseInt(getStyle(obj,attr));}
//设置速度
speed=(json[attr]-icur)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
//停止动画
if(icur!==json[attr]){
flag=false;}//假设有三个json的值，三个值中只要有一个没达到目标值，flag值就为false
if(attr=="opacity"){obj.style[attr]=icur;}else{obj.style[attr]=icur+speed+"px";}
//obj.style.width=obj.style[attr] 注意 style[attr]
if(flag){clearInterval(obj.timer);if(fn){fn()}
}}},30);
}
</script>
</head>
<body>
<div id="div1"> </div>
<div id="div2"></div>
<div id="div3"></div>
</body>
</html>不知道是什么问题，跪求请大神帮忙看看。
