For security issues, Microsoft has completely closed the function of asp.net ajax for cross domain Switching. if cross domain ajax is not very sophisticated and careful, it will indeed give hackers a chance to attack. however, cross domain ajax is indeed a very useful and even important technology. If big data such as yahoo and google are used, cross domain ajax will be completely blocked, it is unfavorable to ajax.net.
On the other hand, asp.net ajax is really good and very convenient. It is also integrated with Visual Studio. If asp.net ajax can be used, cross domain can be implemented, and security can be ensured, that's not a perfect thing.
I have done this by myself. It not only achieves safe cross domain ajax, but also bypasses Microsoft's blocking of cross domain requests in asp.net ajax, making full use of the convenience of asp.net ajax development. haha, I don't know what other people in the world have done.
& L