window.parent为空或不为对象

<%@ Page language="c#" Codebehind="mainfrm.aspx.cs" AutoEventWireup="false" Inherits="GM.mainfrm" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<TITLE>main</TITLE>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<frameset cols="180,580" border="0" frameSpacing="0" frameBorder="0">
<frame name="left" id="left" src="left.aspx">
<frame name="main" id="main" src="main.aspx" noresize scrolling=no>
</frameset>
</HTML>
我在left.aspx页面中点击一个按钮，实现改变main的地址
js如下    function onClickdo(i)
  {
    var queryParam = "";
    if(i=="1")
    {
      queryParam = "submit.aspx?depart=dept";
    }
    else if (i=="2")
    {
        queryParam = "replylist.aspx";
    }

    window.parent.frames('main').location = queryParam;
  }
</script>
为什么老是提示 window.parent 为空或不为对象，我调试跟踪时发现window.parent是不为空的，而且我把此代码复制到另外一个项目中时，就没有报上面的错误，可以实现功能，比较郁闷

解决方案 »

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我测试了下，没有报错，但是调试的时候发现window.parent.frames('main').location没有被更改
有什么其他的解决方法吗？
不要用top对象，因为这个页面还需要嵌套在别的服务器上的项目中，到时top对象是拒绝访问的
不好意思，我弄错了，没有报错，而且main的url也改了
left.aspx
<%@ Page language="c#" Codebehind="left.aspx.cs" AutoEventWireup="false" Inherits="GM.left" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>left</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"/>
<meta name="CODE_LANGUAGE" Content="C#"/>
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<link href="input.css" rel="stylesheet">
<link href="images/zmjl.css" rel="stylesheet">
<script language="javascript" src="Calendar.js"></script>
<script language="javascript" src="query.js"></script>
<script language="javascript">
  function onClickdo(i)
  {
     var queryParam = "";
    if(i=="1")
    {
      queryParam = "submit.aspx?departmentName=莱西市委书记";
    }
    else if (i=="2")
    {
        queryParam = "replylist.aspx";
    }
             window.parent.frames('main').location=queryParam;
  }
</script>
</HEAD>
<body MS_POSITIONING="GridLayout" topmargin="0" leftmargin="0">
<form id="Form1" method="post" runat="server">
<table border="0" width="100%" id="table1" cellspacing="0" cellpadding="0">
<tr>
<td>
<table border="0" width="180" id="table2" cellspacing="0" cellpadding="0">
<tr>
<td width="13" height="29">
<img border="0" src="images/13.jpg" width="13" height="35"></td>
<td width="179" height="29">
<img border="0" src="images/sjhlx.gif" width="159" height="35"></td>
<td width="8" height="29">
<img border="0" src="images/15.jpg" width="8" height="35"></td>
</tr>
<tr>
<td background="images/16.jpg"></td>
<td bgcolor="#fbfbfb">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center"><img src="images/shuji.jpg" width="120" height="150" border="1"></td>
</tr>
<tr>
<td height="5"></td>
</tr>
<tr>
<td><img style="MARGIN:0px 5px" src="images/qz.gif" align="absMiddle">测试名</td>
</tr>
<tr>
<td height="5" style="HEIGHT: 5px"><FONT face="宋体"></FONT></td>
</tr>
<tr>
<td><img style="MARGIN:0px 5px" src="images/zw.gif" align="absMiddle">市委书记</td>
</tr>

<tr>
<td height="10"></td>
</tr>
<tr>
<td align="center">
<button style="CURSOR:hand;BORDER-RIGHT:0px; BORDER-TOP:0px; BACKGROUND:url(images/qz-btn.gif) no-repeat 0px 0px; BORDER-LEFT:0px; WIDTH:70px; COLOR:white; BORDER-BOTTOM:0px; HEIGHT:29px"
type="button" onclick="onClickdo('1')">留言</button>  <button style="CURSOR:hand;BORDER-RIGHT:0px; BORDER-TOP:0px; BACKGROUND:url(images/qz-btn.gif) no-repeat 0px 0px; BORDER-LEFT:0px; WIDTH:70px; COLOR:white; BORDER-BOTTOM:0px; HEIGHT:29px"
type="button" onclick="onClickdo('2')">答复</button>
</td>
</tr>
<tr>
<td height="5"></td>
</tr>
</table>
</td>
<td background="images/17.jpg"><FONT face="宋体"></FONT></td>
</tr>
<tr>
<td width="13" height="11">
<img border="0" src="images/18.jpg" width="13" height="11"></td>
<td background="images/19.jpg" height="11">
<img border="0" src="images/19.jpg" width="4" height="11"></td>
<td width="8" height="11">
<img border="0" src="images/20.jpg" width="8" height="11"></td>
</tr>
</table>
</td>
</tr>
</table>
<table border="0" width="100%" id="table4" cellspacing="0" cellpadding="0">
<tr>
<td>
<table border="0" width="180" id="table7" cellspacing="0" cellpadding="0">
<tr>
<td width="13" height="29">
<img border="0" src="images/13.jpg" width="13" height="35"></td>
<td width="159" height="29">
<img border="0" src="images/14.jpg" width="179" height="35"></td>
<td width="8" height="29">
<img border="0" src="images/15.jpg" width="8" height="35"></td>
</tr>
<tr>
<td background="images/16.jpg">
</td>
<td bgcolor="#fbfbfb">
<table border="0" width="100%" id="table8" cellpadding="0">
<tr>
<td align="center" height="30">
<p align="center"><font style="FONT-SIZE: 9pt" face="宋体">查询码：  </font><input class="form_007" type="text" id="tbSeekCode" name="tbSeekCode" maxlength="10" runat="server"
onpropertychange="switchEnabled()"></p>
</td>
</tr>
<tr>
<td align="center">
<img border="0" src="images/21.jpg" width="140" height="12"></td>
</tr>

<tr>
<td align="center" height="30"><font style="FONT-SIZE: 9pt" face="宋体"> 标  题：  </font><input type="text" id="tbKeyWord" name="tbKeyWord" size="12" class="form_007" runat="server"></td>
</tr>
<tr>
<td height="40">
<p align="center">
<img border="0" src="images/22.jpg" style="CURSOR:hand" width="68" height="24" onclick="query('1')"> 
<img border="0" src="images/23.jpg" style="CURSOR:hand" width="68" height="24" onclick="resetQuery()"></p>
</td>
</tr>
</table>
</td>
<td background="images/17.jpg"><FONT face="宋体"></FONT>
</td>
</tr>
<tr>
<td width="13" height="11">
<img border="0" src="images/18.jpg" width="13" height="11"></td>
<td background="images/19.jpg" height="11">
<img border="0" src="images/19.jpg" width="4" height="11"></td>
<td width="8" height="11">
<img border="0" src="images/20.jpg" width="8" height="11"></td>
</tr>
</table>
</td>
</tr>
</table>
</form>
</body>
</HTML>其实，我把这两个页面拷贝到另外一个项目中运行，也是可以实现跳转的，但是，就是不知道为什么在当前项目中不行，当前项目缺少什么东西吗
看你贴出来的代码也没什么问题，不过你的代码在Chrome下好像不兼容啊
直接用 parent  不用windows.
找到错误了，页面中引用了别人写的js，js中定义了全局变量parent，所以才会报parent为空或不为对象错误
谢谢大家的帮助