完美运动框架

//获得样式
function getStyle(obj,attr){
   
    if(obj.currentStyle){
       return obj.currentStyle[attr];
    }else{
      return getComputedStyle(obj,false)[attr];
    }
}

//运动函数
function startMove(obj,json,fn){
    clearInterval(obj.timer);
    var iStop = true;
    obj.timer = function(){
       
      for(attr in json){
      
        //获得当前样式
         var iCur =0;
         if(attr=="opacity"){
             icur = parseInt(parseFloat(getStyle(obj,attr))*100);

          }else{
             icur = parseInt(getStyle(obj,attr));
         }

        //获得速度
        var iSpeed = (json[attr] - iCur)/8;
        iSpeed = iSpeed > 0?Math.ceil(iSpeed):Math.floor(iSpeed);
       
       if(json[attr]!=iCur){
           iStop =false;
            
        }

        //运动
        if(attr == "opacity"){
            obj.style.opacity = (iCur + iSpeed)/100;
            obj.style.filter = alpha(opacity =(iCur + iSpeed) );
         }else{
              obj.style[attr] = (iCur + iSpeed) + "px"
           }
       
      }
      if(iStop){
         if(fn)fun();
      }
    }
}