function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}else{
return getComputedStyle(obj,false)[attr];
}
}
function startMove(obj,attr,goal){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icce=0;
if(attr=='opacity'){
icce=Math.round(parseFloat(getStyle(obj,attr))*100);
}else{
icce=parseInt(getStyle(obj,attr));
}
var speed=(goal-icce)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if (icce==goal){
clearInterval(obj.timer);
}else{
if(attr=='opacity'){
obj.style.filer='alpha(opacity:'+(icce+speed)+')';
obj.style.opacity=(icce+speed)/100;
}else{
obj.style[attr]=icce+speed+'px';
}
}
},30)
}
aLi.onmouseover=function(){
startMove(this,'width',600);
}
ali.onmouseout=function(){
startMove(this,'opacity',90);
mouseover改变宽度，mouseout改变透明度，要完美显示，应该还需要再加定时器吧。
合到一起就能完美运行显示，这是为什么
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
ul,li{
list-style: none;
}
li{
width:400px;
height: 200px;
background: green;
border-radius: 10px;
border: 4px solid #111;
filter: alpha(opacity:30);
opacity: 0.3;
}
</style>
<script src="js/move.js"></script>
<script>
window.onload=function(){
var aLi=document.getElementById('ali');
aLi.onmouseover=function(){
startMove(this,'width',600);
}
ali.onmouseout=function(){
startMove(this,'opacity',90);
}
}
</script>
</head>
<body>
<ul>
<li id="ali"></li>
</ul>
</body>
</html>
这个是与之相关的html