Cross-Domain Ajax

Because the browser has a same-origin policy mechanism, the same-origin policy prevents a document or script loaded from one source from getting or setting the properties of another source-loaded document.

Special : Because the same-origin policy is the browser's limit, so the request send and response can be done, but the browser does not accept it.

Browser-origin policies are not restricted to all requests:

• Restriction: XMLHttpRequest
• No: IMG, iframe, script and other tags with src attributes

Cross-domain, cross-domain access, such as: http://www.c1.com domain names send requests to http://www.c2.com domains.

1. Jsonp for cross-domain requests

JSONP (Jsonp-json with padding is a "usage pattern" of JSON), using the SRC attribute of the script tag (the browser allows the script tag to cross the domain)

Cross-Domain Ajax