How to understand Ajax cross-domain Session and cross-domain access

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one。 With regard to ajax cross-domain requests, it is always unsuccessful to use jsonp. Although data can be returned, an error is reported at error. The reason is that the returned data format is not in jsonp format. But requests constructed in C # can return data.

two。 It is certain that a third-party ajax request cannot get the session of your current user.

The task is like this, Alipay's page returns the notify page (this page is accessed asynchronously), and my C# processing has a processing module, which needs to judge that if you have logged in, add points and other operations, the result is always can not get session data, but clearly logged in ah. The misunderstanding here is that our current domain must have been logged in, but there is no login for the asynchronous request on Alipay.

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