实现一个简单的MVVM框架
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纯javascript实现双向数据绑定：https://www.codeproject.com/Articles/5264704/Two-Way-Data-Binding-in-Pure-JavaScript
javascript MVVM框架介绍：https://www.codeproject.com/Articles/5265632/Introducing-MVVM-Architecture-in-JavaScript-TypeSc
谢谢你，Volodymyr Kopytin大神！