对子域的AJAX调用是否考虑跨站点脚本?

I have Server A (www.example.com) sending information to Server B. I can only have HTML / JS on Server A (and have to do the "crunching" on Server B) so I'm trying to send form data via AJAX (trying to avoid a form post to Server B - don't ask).I have Server A (www.example.com) sending infor