js之淡入淡出

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
#div1{width:200px;height:200px;filter:alpha(opacity:30);opacity:0.3;}
</style>
<script>
window. ()
{
	var oDiv=document.getElementById('div1');
	oDiv. ()
	{
		startMove(100);
	};
	oDiv. ()
	{
		startMove(30);
	};
};
var timer=null;
var alpha=30;
function startMove(number)
{
	var oDiv=document.getElementById('div1');
	
	clearInterval(timer);
	timer=setInterval(function ()
	{
		var speed=0;
		if(alpha<number)
		{
			speed=5;
		}
		else
		{
			speed=-5;	
		}
		if(alpha==number)
		{
			clearInterval(timer);	
		}
		else
		{
			alpha+=speed;
			oDiv.style.filter='alpha(opacity='+alpha+')';
			oDiv.style.opacity=alpha/100;	
		}
	},30);
};
</script>
</head>

<body>
</body>
<div id="div1">
<img src="file:///E|/250-chocolate-19-momme-seamless-silk-bedding-set-cymbidium-02.jpg" />
</div>
</html>
js之淡入淡出

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