What is JSONP ?
http://stackoverflow.com/questions/2067472/what-is-jsonp-all-about
What is CORS?
http://www.html5rocks.com/en/tutorials/cors/
more :
http://json-p.org/
https://en.wikipedia.org/wiki/JSONP
原文：http://www.cnblogs.com/lein-wang/p/4637705.html