如何下面代码中div2的透明度和宽高同时变化？
<!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>任意属性值2.1在之前基础上加透明度</title>
<style>
body,div,span{
margin:0;
padding:0;
}
div{width:200px;
height:50px;
background-color:yellow;
margin:10px;
border:#000 solid 4px;
filter:alpha(opacity:30);
opacity:0.3;
}
</style>
<script>
window.onload=function(){
/*var oDiv=document.getElementsByTagName("div");
for( var i=0;i<oDiv.length;i++){
oDiv[i].onmouseover=function(){
startMove(this,400);
}
oDiv[i].onmouseout=function(){
startMove(this,200);
}
}
var timer=null; */
var div1=document.getElementById("div1");
var div2=document.getElementById("div2");
div1.onmouseover=function(){
startMove(this,'opacity',100);
}
div1.onmouseout=function(){
startMove(this,'opacity',30);
}
div2.onmouseover=function(){
startMove(this,'height',200);
}
div2.onmouseout=function(){
startMove(this,'height',50);
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
function startMove(obj,attr,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icur=0;
if(attr=='opacity'){
icur=Math.round(parseFloat(getStyle(obj,attr))*100);
}
else{var icur=parseInt(getStyle(obj,attr));}
var speed=(iTarget-icur)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(icur==iTarget){
clearInterval(obj.timer);
}
else{
if(attr=='opacity'){
obj.style.filter='alpha(opacity:'+(icur+speed)+')';
obj.style.opacity=(icur+speed)/100;
}
else{obj.style[attr]=icur+speed+'px';}
/*这里如果不用obj.style[attr]而是用obj.style.attr是不可以的因为attr定义的是'width'*/
}
},
30)}
}
</script>
</head>
<body>
<div id="div1"><span id="Draven">德莱文</span></div>
<div id="div2"><span id="Draven">金克斯</span></div>
<div id="div3"><span id="Draven">卢锡安</span></div>
</body>
</html>
