"AJAX Cross-Domain Solution: JSONP Video Tutorial" The core of ajax is the JavaScript object XmlHttpRequest. This object was first introduced in Internet Explorer 5 and is a technology that supports asynchronous requests. This video introduces the ajax cross-domain solution.
"AJAX cross-domain solution: JSONP video tutorial" This video includes ajax cross-domain restriction issues, cross-domain solutions, and the implementation of jsonp principles and processes.