react 项目支持 装饰器写法 Support for the experimental syntax 'decorators-legacy' isn't currently enabled

npm install @babel/plugin-proposal-decorators

在package.json里面加一句话

"babel": {
    "plugins": [
      [
        "@babel/plugin-proposal-decorators",
        {
          "legacy": true
        }
      ]
    ],
    "presets": [
      "react-app"
    ]
  },