<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
#div1
{
width: 200px;
height: 200px;
background-color: green;
filter: alpha(opacity=20);
opacity: 0.2;
}
</style>
<script type="text/javascript">
var alpha = 30;
var timer = null;
window.onload = function () {
var oDiv = document.getElementById("div1");
oDiv.onmouseover = function () {
Move(100);
}
oDiv.onmouseout = function () {
Move(30);
}
}
function Move(iTarget) {
var speed = 0;
clearInterval(timer);
var oDiv = document.getElementById("div1");
timer = setInterval(function () {
if (alpha < iTarget) {
speed = -3;
} else if (alpha == iTarget) {
speed = 3;
}
//开始变色
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>