node.js – NODE_ENV未被识别为内部或外部命令

我正在开发node.js,并希望兼顾生产和开发环境.我发现在运行node.js服务器时设置NODE_ENV可以完成这项工作.但是,当我尝试在package.json脚本中设置它时,它给了我错误：

下面是我的package.json

{
  "name": "NODEAPT","version": "0.0.0","private": true,"scripts": {
    "start": "NODE_ENV=development node ./bin/server","qa2": "NODE_ENV=qa2  node ./bin/server","prod": "NODE_ENV=production node ./bin/server"
  },"dependencies": {
    "body-parser": "~1.15.1","cookie-parser": "~1.4.3","debug": "~2.2.0","express": "~4.13.4","fs": "0.0.1-security","jade": "~1.11.0","morgan": "~1.7.0","Oracledb": "^1.11.0","path": "^0.12.7","serve-favicon": "~2.3.0"
  }
}

我运行我的节点服务器为：npm run qa2例如.

我不知道我做错了什么.任何帮助表示赞赏

"scripts": {
    "start": " SET NODE_ENV=development &  node ./bin/server","qa2": "SET NODE_ENV=qa2 & node ./bin/server","prod": "SET NODE_ENV=production & node ./bin/server"
  },

"scripts": {
    "start": " cross-env NODE_ENV=development &  node ./bin/server","qa2": "cross-env NODE_ENV=qa2 & node ./bin/server","prod": "cross-env NODE_ENV=production & node ./bin/server"
  },