不行，app 域好像只能是域，不能是 ip 地址.

No, it looks like the app domain can only be a domain and not an ip address.

例如在应用设置页面中，在应用域附近悬停?"并看到:

For example in the app settings page, near the App Domain hover the '?' and see:

在域和子域上启用身份验证

Enable auth on domains and subdomain(s)

另外，我找到了这个页面:http://developers.facebook.com/docs/appproperties/ 它指的是 REST api，所以它不是最新的，但它明确指出有两个不同的属性:base_domain(s) 和 ip_list.

Also, I found this page: http://developers.facebook.com/docs/appproperties/ it refers to the REST api and so it's not that up to date, but it clearly states there that there are two different properties: base_domain(s) and ip_list.

我建议您尝试放置一个普通域，看看会发生什么.

I suggest that you try to put a normal domain and see what happens.