Jsonp principle Finishing

Website A (a.com) needs to obtain the relevant data of website B (B.Com)

The basic principle: the website can obtain different domain website's js, the picture and so on content, therefore JSONP can request the concrete step only through GET requests: 1, in the website a new window function, such as Window.dealcallbanck () 2, Create a new url:b.com/arg?arg1=xxx&arg2=xxx on site B to return the data required for site A 3, in Site A, use JS to create a new script tag, and then set src=b.com/arg?arg1=xxx  &ARG2=XXX4, can see B.com/arg returned data is Dealcallbanck (ARG1,ARG2) 5, because the returned content is in a JS, so you can directly trigger the Dealcallbanck event Of course, you can also use jquery more easily

Jsonp principle Finishing