实现对普通对象的变化检测，MVVM模式中的 observer
实现对普通对象的变化检测，MVVM模式中的 observer
1、clone 项目
git clone https://github.com/HcySunYang/jsonob.git
2、安装依赖
npm install
3、构建项目
npm run build
4、运行
使用浏览器打开 test/index.html
在使用 defineProperty 之后，在修改对象属性之前输出该对象，该属性的值为修改之前的值
实际输出的是修改之后的值，vue2 中也存在该现象，但是通过 Proxy 方法就可以正常输出修改之前的值，请问为什么会出现该现象
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