<!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>任意值运动框架</title>
<style>
div{width:200px;height:200px;background:red;float:left;border:10px black solid;margin:50px;font-size:50px;color:yellow;}
#div4{filter:alpha(opacity:30);opacity:0.3;}
</style>
<script>
window.onload=function (){
	var oDiv1=document.getElementById('div1');
	var oDiv2=document.getElementById('div2');
	var oDiv3=document.getElementById('div3');
	var oDiv4=document.getElementById('div4');
	oDiv1.onmouseover=function (){
		StartMove(this,'width',500);
	};
	oDiv1.onmouseout=function (){
		StartMove(this,'width',200);
	};
	oDiv2.onmouseover=function (){
		StartMove(this,'height',500);
	};
	oDiv2.onmouseout=function (){
		StartMove(this,'height',100);
	};
	oDiv3.onmouseover=function (){
		StartMove(this,'font-size',100);
	};
	oDiv3.onmouseout=function (){
		StartMove(this,'font-size',50);
	};
	oDiv4.onmouseover=function (){
		StartMove(this,'opacity',100);
	};
	oDiv4.onmouseout=function (){
		StartMove(this,'opacity',30);
	};
};
function getstyle(obj,name)
{
		if(obj.currentStyle) 		//针对ie获取
		{
				return obj.currentStyle[name];
		}
		else			//针对非行间样式
		{
			return getComputedStyle(obj,null)[name];
		}
};
function StartMove(obj,ss,itarget)
{
	
	clearInterval(obj.timer);
	obj.timer=setInterval(function (){
		var cur=0;
		if(ss=='opacity'){
			cur=parseFloat(getstyle(obj,ss))*100
		}
		else
		{
			cur=parseInt(getstyle(obj,ss));
		}
		var speed=(itarget-cur)/4;
		speed=speed>0?Math.ceil(speed):Math.floor(speed);
		if(itarget-cur==0){
			clearInterval(obj.timer);	
		}
		else{
			if(ss=='opacity')
			{
				obj.style.filter='alpha(opacity='+(cur+speed)+')';
				//通过if-else里的取整解决ie里透明度获取值存在偏差问题
				if((cur+speed)>=30)
				{
					obj.style.opacity=Math.ceil((cur+speed))/100;
				}
				else
				{
					obj.style.opacity=Math.floor((cur+speed))/100;
				}
				document.getElementById('txt1').value=cur+speed;
			}
			else
			{
				obj.style[ss]=cur+speed+'px';
			}
		}
	},30);
};
</script>
</head>

<body>
<div id="div1">
变宽</div>
<div id="div2">
变高</div>
<div id="div3">
字符变大</div>
<div id="div4">
<input id="txt1" type="text" ? />
</div>
</body>
</html>