<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
div{
width: 100px;
height: 100px;
background: red;
float: left;
margin-right: 20px;
position: relative;
left:500px;
top: 100px;
filter: alpha(opacity = 30);
opacity: 0.3;
}
</style>
<script type="text/javascript">
window.onload=function(){
var aDiv = document.getElementsByTagName('div');
for(var i = 0;i<aDiv.length;i++){
aDiv[i].timer = null;
aDiv[i].Valpha = 30;
aDiv[i].onmouseover = function(){
startMove(this,30);
}
aDiv[i].onmouseout = function(){
startMove(this,100);
}
}
function startMove(obj,target){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var speed = (target - obj.Valpha)/6;
speed = speed > 0?Math.ceil(speed) : Math.floor(speed);
if(obj.Valpha == target){
clearInterval(obj.timer);
}
else{
obj.Valpha += speed;
obj.style.filter = 'alpha(opacity:' + obj.Valpha +')';
obj.style.opacity = obj.Valpha;
}
},30)
}
}
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
</body>
</html>
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