(GWT Ext is a powerful page development control library based on Google Web Toolkit (GWT) and ExtJs. It is well suited for rapid development of rich Internet usage in pure Java language. This series of articles will explain the basic structure and functional characteristics of GWT Ext in detail, and demonstrate the detailed implementation of this technology through code examples. This article is the third part of the GWT Ext Experience Tour series. We will experience the role of various design managers, understand our common programming methods of design managers, and summarize some experience. In the introduction of trees, we will introduce in detail some features of trees from the initialization of synchronous and asynchronous methods of trees.
GWT Page Design.docx)