我的为什么不能实现链式运动..找半天bug了

<!DOCTYPE html>
<html>
   <head>
       <meta charset="UTF-8">
       <title></title>
       <style type="text/css">
           div{
               width:100px;
               height:50px;
               background:yellow;
               margin:20px;
               margin-bottom:none;
           }
       </style>
   </head>
   <script type="text/javascript">
       window.onload = function(){
           var list=document.getElementsByTagName("div");
           for(var i=0 ; i<list.length ; i++){
               list[i].tim=null;
               list[i].onmouseover=function(){
                   var g=this;
                   change(this,"width",200,function(){
                       change(g,"height",100);
                   });
               }
               list[i].onmouseout=function(){
                   change(this,"width",100);
               }
           }
       }

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

       function change(obj,att,iTarget,fn){
           var speed=null;
           clearInterval(obj.tim);
           obj.tim=setInterval(function(){
               var geta=parseInt(getAttr(obj,att))
               speed=(iTarget-geta)/20;
               speed=speed>0?Math.ceil(speed):Math.floor(speed);
               if(geta==iTarget){
                   if(fn){
                       fn();
                   }
                   clearInterval(obj.tim);
               }else{
                   obj.style[att]=geta+speed+"px";
               }
           },30)
       }
   </script>
   <body>
       <div id="d1">
       </div>
       <div id="">
       </div>
       <div id="">
       </div>
   </body>
</html>

朕的江山啊

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我的为什么不能实现链式运动..找半天bug了

1回答