(Official Java development engineer QQ group (27163376), please enter your ID for verification. This information is really good. I have studied it a few times myself, and have operated all the examples in it. I don't do anything about it. I support it. I hope it can help the office staff who pay attention to the development of extjs. Thank you, Extjs is a javascript structure, and its development team The core developer Jack uses OOP to the extreme. We have to sigh that the seemingly clueless javascript language is so elegant and impeccable. In Jack's eyes, javascript is a lady who looks arrogant, defiant, and all-round. There is no intimacy, but as long as you study and arrange carefully, you will be favored by your lady, but, I am very sorry, Jack has already rushed to the top, and gave birth to a child - Extjs.
Easily get ExtJS.pdf)