关于应用mobx时因为缺少ES7的Decorators支持而报错的问题

[ckinmind]

在Counter的demo中应用了mobx, 但是开始运行的时候总是报错，报错信息如下

 Decorators are not officially supported yet in 6.x pending a proposal update. 
However, if you need to use them you can install the legacy decorators transform with:

npm install babel-plugin-transform-decorators-legacy --save-dev

and add the following line to your .babelrc file:

{
  "plugins": ["transform-decorators-legacy"]
}

Decorators 装饰者模式是ES7中提案，要支持这个需要安装一个babel-plugin-transform-decorators-legacy 的插件，并且需要修改.babelrc中的配置