<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>透明度</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style>
#div1{width:200px;height:200px;background: red;filter:alpha(opacity:30);opacity: 0.3;}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=function(){
movestar(100);
}
oDiv.onmouseout=function(){
movestar(30);
}
}
var timer=null;
var alpha=30;
function movestar(iTarget){
var oDiv=document.getElementById('div1');
clearInterval(timer);
timer=setInterval(function(){
var speed=0;
if(alpha<iTarget){
speed=10;
}else{
speed=-10;
}
if(alpha==iTarget){
clearInterval(timer);
}else{
alpha+=speed;
oDiv.style.filter='alpha(opacity:'+alpha+')';
oDiv.style.opacity=alpha/100;
}
},30)
}
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
