facebook iframe use fbml

http://wiki.developers.facebook.com/index.php/Fb_force_mode

除了用xfbml之外, 還有這招可以用

For example, if you were using an iframe application, and wanted one page to be rendered as FBML, you could append ?fb_force_mode=fbml to the address, which will cause it to render as FBML. This can be particularly useful when using fb:request-form with iframe applications.

If your application is an iframe application and you wish to use FBML, you will need to specify the full address, including http://apps.facebook.com.