为什么给两个li 都调用了函数，却只有第一个起了作用，且没发现对象的timer属性在哪里初始化？？？？？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
ul{
list-style: none;
}
ul li{
height: 100px;
width: 200px;
background: yellow;
margin-bottom: 20px;
border:2px solid black;
opacity: 0.3;
}
</style>
<script type="text/javascript">
window.onload=function(){
var li1=document.getElementById("li1");
li1.timer=null;
var li2=document.getElementById("li2");
li2.timer=null;
li1.onmouseover=function(){
startMove(this,'opacity',100);
}
li1.onmouseout=function(){
startMove(this,'opacity',30);
}
li2.onmouseover=function(){
startMove(this,'width',400);
}
li2.onmouseout=function(){
startMove(this,'width',200);
}
}
function startMove(obj,attr,target){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var curw=0;
if(attr='opacity'){
curw=Math.round(parseFloat(getStyle(obj,attr))*100);
}else{
curw=parseInt(getStyle(obj,attr));
}
var speed=(target-curw)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(curw==target){
clearInterval(obj.timer);
}
else{
if(attr='opacity'){
obj.style.filter='alpah(opacity:'+curw+speed+')';
obj.style.opacity=(curw+speed)/100;
}
else{
obj.style[attr]=curw+speed+'px';
}
}
},30);
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
</script>
</head>
<body>
<ul>
<li id="li1"></li>
<li id="li2"></li>
</ul>
</body>
</html>
