JavaScript实现透明度的改变

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鼠标的移入移出，显示的透明度在一定时间内发生的改变

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<html>
<head>
	<title></title>
	<meta charset="utf-8">
<style>
#div1{
	width:200px;
	height:200px;
	background:red;
	
	opacity:0.5;
</style>
<script>
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){
	clearInterval(timer);
	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.opacity=alpha/100;
		}
		
	},30)
}
</script>
</head>
<body>
<div id ="div1">
	
</div>
</body>
</html>
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