上述问题我发现了原因
因为member.php返回的content-type是application/xml，我的IE浏览器不支持这个content-type
抓包如下：
HTTP/1.1 200 OK
Date: Sat, 29 May 2010 12:18:07 GMT
Server: Apache/2.2.13 (FreeBSD) mod_ssl/2.2.13 OpenSSL/0.9.8k DAV/2 PHP/5.2.11 with Suhosin-Patch
X-Powered-By: PHP/5.2.11
Set-Cookie: JNXG_lastact=1275135487%09member.php%09logging; expires=Sun, 30-May-2010 12:18:07 GMT; path=/
Set-Cookie: JNXG_invite_auth=deleted; expires=Fri, 29-May-2009 12:18:06 GMT; path=/
Set-Cookie: JNXG_sid=q32Wg5; expires=Sun, 30-May-2010 12:18:07 GMT; path=/
Expires: -1
Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0
Pragma: no-cache
Content-Length: 5090
Keep-Alive: timeout=5, max=94
Connection: Keep-Alive
Content-Type: application/xml; charset=gbk
很奇怪我的IE为啥不支持这个content-type，我在注册表里设置了也无效
