加了getstyle()没有效果了
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
ul li{
list-style: none;
}
ul li{
width: 200px;
height: 100px;
background: yellow;
margin-bottom:20px;
border: 4px solid #00ffff;
}
</style>
<script type="text/javascript">
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,400);
}
aLi[i].onmouseout=function(){
startMove(this,200);
}
}
}
// var timer=null;
var icur=parseInt(getStyle(obj,'width'));
function startMove(obj,target){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var speed=(target-icur)/20;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if (icur==target) {
clearInterval(obj.timer);
}
else{
obj.style.width=icur+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></li>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>
