透明度不会变呀
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
ul,li{
list-style: none;
}
ul li{
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 20px;
filter:alpha(opacity:30);
opacity:0.3;
border: 4px solid #000;
}
</style>
<script>
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,'width',400);
}
ali[i].onmouseout=function(){
startMove(this,'width',200);
}
}*/
var Li1=document.getElementById('li1');
var Li2=document.getElementById('li2');
Li1.onmouseover=function(){
startMove(this,'opacity',100)
}
Li2.onmouseout=function(){
startMove(this,'opacity',30);
}
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
//var timer=null;
var alpha=30;
function startMove(obj,attr,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icur=0;
if(attr=='opacity'){
icur=Math.round(parseFloat(getStyle(obj,attr))*100);
}
else{
icur=parseInt(getStyle(obj,attr));
}
var speed=(iTarget-icur)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(icur==iTarget){
clearInterval(obj.timer);
}
else{
if (attr=='opacity') {
obj.style.filter='alpha(opacity:'+(icur+speed+')';
obj.style.opacity=(icur+speed)/100;
}
else{
obj.style[attr]=icur+speed+'px';
}
}
},30)
}
</script>
</head>
<body>
<ul>
<li id="li1"></li>
<li id="li2"></li>
<li></li>
</ul>
</body>
</html>
