React 是 facebook 开源的一套框架，可总结为以下几个特点：
- 基于 JSX 语法糖实现
- JUST THE UI：在多层架构的设计模式中，React 并不算 MVC 的架构，它可理解为 MVC 的 V 层。
- VIRTUAL DOM：虚拟DOM，是轻量的 js 对象，只保留了原生 dom 的一些常用的属性和方法。
- DATA FLOW： React是单向响应的数据流。
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