A, CORS how to achieve
Second, what network security knowledge that you understand (say XSS and CSRF)
https://segmentfault.com/a/1190000002627927
1.XSS how to solve
2.CSRF how to solve
Three, JavaScript inheritance achieve
Four, jsonp principle
https://www.runoob.com/json/json-jsonp.html
1. What is jsonp
Jsonp (JSON with Padding) is a json "use mode" that allows it to obtain information from other web domain name (website), that cross-domain data is read.
Why do we need a special technique different domain (website) to access data from (JSONP) it? This is because the same-origin policy.
Same-origin policy, it is a well-known security policy proposed by Netscape, now all JavaScript-enabled browsers will use this strategy.
Six, JSON
https://www.runoob.com/json/json-tutorial.html
The JSON: J AVA S cript O bject N otation (the JavaScript Object Notation)
JSON syntax for storing and exchanging text messages. Similar to XML.
JSON is smaller than XML, faster, and easier to resolve.
1. What is JSON
Refers JSON JavaScript Object Notation ( J AVA S cript O bject N otation)
Javascript use JSON syntax to describe data objects