JSON and JSONP

JSON is a lightweight data interchange format compared to XML.

JSON format: Data in key-value pairs, data separated by commas, curly braces to save the object, square brackets to save the array;

Jsonp is a cross-domain approach to data access.

Rationale: After the client declares the callback callback function, the client requests data across the domain through the script tag to the server, then the service side returns the appropriate JSON data and executes the callback function dynamically.

Summary JSONP:

Two points to be noted:

1. Do not provide error handling mechanism, there is data return, no content is not displayed, get a 404 error

2. If you use a service that you do not trust, it can cause great security risks.

JSON and JSONP