dva @connect Decorators must be placed *after* the ‘export‘ keyword. Remove the ‘decoratorsBeforeEx

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cnpm install @babel/plugin-proposal-decorators --save-dev
//package.json 添加

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