Model-View-ViewModel (MVVM) Explained 转摘自：https://www.wintellect.com/blogs/jlikness/model-view-viewmodel-mvvm-explained

The purpose of this post is to provide an introduction to the Model-View-ViewModel (MVVM) pattern. While I've participated in lots of discussions online about MVVM, it occurred to me that beginners who are learning the pattern have very little to go on and a lot of conflicting resources to wade through in order to try to implement it in their own code. I am not trying to introduce dogma but wanted to pull together key concepts in a single post to make it easy and straightforward to understand the value of the pattern and how it can be implemented. The purpose of this post is to provide an intro