How does html5 interact with backend data?

Simply put, the front-end technology communicates with the back-end technology and defines the interactive interface according to the business. The forms of the interactive interface may include:

1. The backend outputs data to HTML page, which can be obtained from HTML when accessing data in JS control logic.

2. Define the interfaces of front-end and back-end requests, generally AJAX interfaces. If there are cross-domain problems or some special business scenarios, JSONP or other methods may be used. In short, no matter which method is used, the purpose is to dynamically request data and then refresh the page content according to the returned data. The format of the returned data is mainly JSON format, but it is not excluded that some special business scenarios need to use XML or other formats.