JavaScript 完美运动框架

function getStyle(obj, name)
{
	if(obj.currentStyle)
	{
		return obj.currentStyle[name];
	}
	else
	{
		return getComputedStyle(obj, false)[name];
	}
}

function startMove(obj, json, fnEnd)
{
	clearInterval(obj.timer);
	obj.timer=setInterval(function (){
		var BStop=true;
		for (var attr in json){
            var cur=0;

            if(attr=='opacity')
            {
                cur=Math.round(parseFloat(getStyle(obj, attr))*100);
            }
            else
            {
                cur=parseInt(getStyle(obj, attr));
            }

            var speed=(json[attr]-cur)/6;
            speed=speed>0?Math.ceil(speed):Math.floor(speed);
            if(cur!=json[attr])
            	BStop=false;


                if(attr=='opacity')
                {
                    obj.style.filter='alpha(opacity:'+(cur+speed)+')';
                    obj.style.opacity=(cur+speed)/100;
                }
                else
                {
                    obj.style[attr]=cur+speed+'px';
                }
            }


		if (BStop){
			clearInterval(obj.timer);
			if (fnEnd)fnEnd();

		}

	}, 30);
}