<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>透明動畫</title>
<style type="text/css">
body,div{
margin:0;
padding:0;
}
#div1{
width:200px;
height:200px;
background:red;
filter:alpha(opacity:30);
opacity:0.3;
}
</style>
</head>
<body>
<div id="div1"></div>
<script type="text/javascript">
window.onload = function(){
var oDiv = document.getElementById('div1');
oDiv.onmouseover = function(){
startMove(100);
}
oDiv.onmouseout = function(){
startMove(30);
}
}
var timer=null;
var alpha = 30;
function startMove(iTarget){
var oDiv = document.getElementById('div1');
clearInterval(timer);//先關定時器
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+')'; //for IE
oDiv.style.opacity=alpha/100;
//for Chrome及Firefox
}
},30)
}
</script>
</body>
</html>
鼠标离开事件。。iTarget=30，定义的alpha=30.。那么 if(alpha == iTarget)成立，不就关了定时器？？如何运作的？
快乐的小牛妞
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