What is cross domain requestIn simple, cross domain request is to request resource from other domain in one domain. Note, the "other domain" doesn't just mean domain name only, it includes much more. If the protocol, domain name, port is not the same, two domains will be considered different. Below example describes what is considered as different domain.http://www.a.com/a.jshttp://www.a.com/b.js               # Same domainhttp://www.a.com/lab/a.js         # Same domainhttp://www.a.com/script/b.js     # Same domainhttp://www...