Detailed introduction to AJAX cross-domain (code example)

The content of this article is a detailed introduction (code example) about AJAX cross-domain. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

There are two commonly used solutions to AJAX's cross-domain problems. Record them briefly and check the reference materials for details. The following example creates two domain names for testing, www.test.com and www.example.com.

Same Origin Policy

The Same Origin Policy restricts how documents or scripts loaded from one source interact with resources from another source. This is a critical security mechanism for isolating potentially malicious files.

Two pages, if the domain name, protocol,port are the same, they are from the same source, and there is no problem with the interaction between them. The same-origin policy is a very important security mechanism, but sometimes it is necessary to break through this mechanism, which requires cross-domain.

JSONP

JSONP is a very common method. It is implemented using the principle that the