Understanding about extjs store, Recode, and Reader

I recently learned about extjs. When I learned about extjs's data storage, I encountered the sotre object. Some of them were data + reader, and some of them were using proxy + reader. You can learn a little about the API.

First, you can understand the store as a data table in the database. The recode level is the record in the table. First, I personally feel that the records in the table are obtained from the server or local client through data or proxy. Reader is interpreted as a recod in a unified format.

The two parameters of Reader: Data/Proxy + recode have never understood the difference between data and proxy. Data is local data. Proxy is remote. The URL is short for httpproxy. Ext. recode. Create is to create a recode format object.