在google maps v3 中的获得ajax对象是哪个类啊（v2中的是GXmlHttp）
等。。。。
------解决方案--------------------
已经取消了没有了.
https://groups.google.com/forum/?fromgroups=#!msg/google-maps-js-api-v3/pOGfPM1rClw/aLTr6EghEgoJ
Not really. To first order, change the G* namespace to google.maps.*
(unless you were already using that namespace). Then address the
differences. There are things that don't exist (GDownloadUrl, GXml,
GXmlHttp, ...), and things that have been changed (directions,
polylines, polygons, markers ...)