~~~~iframe onload 事件的问题~~~~

Question

<script type="text/javascript">
       var ifr=document.getElementsByTagName("iframe");
       for(var i=0;i<ifr.length;i++){
              ifr[i].contentWindow.onload=function(){                     
                           要在iframe的onload事件里面获取当前的i
                                    可以找到吗？？？
                   
              }
       }
</script>