js获取GridView中CheckBox的选中状态

<script language="javascript">    function show()     {         var ele = event.srcElement;         if(ele.tagName == "INPUT" && ele.type == "checkbox")         {            var text = ele.parentElement.title;            if(ele.checked == true)            {                alert(text + "已被勾选");             }            else            {                alert(text + "已取消勾选");             }         }    }    </script>

/*============================GriView列表项绑定事件==========================*/

 protected void gvListInfo_RowDataBound(object sender, GridViewRowEventArgs e)    {           CheckBox chk = (CheckBox)e.Row.FindControl("x_chkID");           chk.Attributes["OnClick"] = "javascript:show();";    }