为啥出不来效果啊，求解答
#div1 {
width:200px;
height:200px;
background:red;
filter:alpha(opacity:30);
opacity:0.3;
}
</style>
<script type="text/javascript">
window.onload = function(){
var oDiv = document.getElementById('div1');
oDiv.onmouseover = function(){
startMove(30);
}
oDiv.onmouseout = function(){
startMove(100);
}
}
var timer = null;
var alpha = 30;
function startMove(iTarget){
var oDiv = document.getElementById('div1');
clearInterval(timer);
timer = setInterval(function(){
var speed;
if(alpha > iTarget){
speed = -10;
}
else{
speed = 10;
}
if(alpha == iTarget){
clearInterval(timer);
}
else{
alpha+=speed;
oDiv.style.filter = 'alpha(opacity:'+alpha+')';
oDIvc.style.opacity = alpha/100;
}
},30)
}
</script>
</head>
<body>
<div id="div1">透明度/div>
在火狐浏览器上出不来效果，透明度没变化
