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                        /JS動(dòng)畫(huà)效果

求助這一節(jié)動(dòng)畫(huà)最后透明度變成0.88了，沒(méi)有變回1，求大神幫助看看

<!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>無(wú)標(biāo)題文檔</title>
<style?type="text/css">
*{margin:0;padding:0;}
span{left:32px;top:20px;position:absolute;opacity:1;filter:alpha(opacity:100);}
img{width:40px;height:40px;}
a{float:left;display:block;height:100px;width:100px;border:1px?solid?#CCC;font-family:"微軟雅黑";font-size:14px;color:#999;text-align:center;margin:10px;position:relative;text-decoration:none;}
a:hover{color:#060;}
p{top:60px;left:36px;position:absolute;}
</style>
<script?src="newmove.js"></script>
<script>
window.onload=function(){
	var?ai=document.getElementsByTagName("a");
	for(var?i=0;i<ai.length;i++){
		ai[i].onmouseover=function(){
			var?This=this;
			var?span=This.getElementsByTagName('span')[0];
			startMove(span,{top:-25,opacity:0},function(){span.style.top=40+"px";startMove(span,{top:20,opacity:100})}
			);
			}
		}
	
}

</script>

</head>

<body>
<a?href=""><span><img?src="1_1.png"?/></span><p>網(wǎng)絡(luò)</p></a>
<a?href=""><span><img?src="1_2.jpg"?/></span><p>娛樂(lè)</p></a>
<a?href=""><span><img?src="1_3.jpg"?/></span><p>酒店</p></a>
</body>
</html>

運(yùn)動(dòng)框架代碼如下

function?getStyle(obj,attr){
if(obj.currentStyle){
//IE
return?obj.currentStyle[attr];
}?else?{
return?getComputedStyle(obj,false)[attr];
}
}
//json?=?{attr1:iTarget1,attr2:iTarget2}
function?startMove(obj,json,fn){
clearInterval(obj.timer);
obj.timer?=?setInterval(function(){
var?flag?=?true;?//標(biāo)志所有運(yùn)動(dòng)是否到達(dá)目標(biāo)值
for(var?attr?in?json){
//取當(dāng)前值
var?icur?=?0;
if(attr?==?'opacity'){
icur?=?Math.round(parseFloat(getStyle(obj,attr))*100);
}?else?{
icur?=?parseInt(getStyle(obj,attr));
}
//求速度
var?speed?=?(json[attr]-icur)/8;
speed?=?speed?>?0???Math.ceil(speed)?:?Math.floor(speed);
if(icur?!=?json[attr]){
flag?=?false;
}?
if(attr?==?'opacity'){
obj.style.filter?=?'alpha(opacity:'+(icur+speed)+')';?//IE
obj.style.opacity?=?(icur+speed)/100;?
}?else?{
obj.style[attr]?=?icur?+?speed?+'px';
}
if(flag)?{
clearInterval(obj.timer);
flag?=?true;
if(fn){
fn();
}
}
}
},20);
}//?JavaScript?Document