How does a web page connect to a database to capture information?

Question

There is a button and an input box on a web page. Click the button to connect to the database to capture information, and then return the information to the input box on the web page. I'm a newbie. Is there any source that I can refer to?

天蓬老师 · Answer

Getting data asynchronously, or cross-domain, there are related courses in php Chinese online