报错信息

D:\workspace\github\minio\browser>npm run dev
> browser@0.0.1 dev D:\workspace\github\minio\browser
> NODE_ENV=dev webpack-dev-server --devtool cheap-module-eval-source-map --progress --colors --hot --content-base dev
'NODE_ENV' 不是内部或外部命令，也不是可运行的程序
或批处理文件。
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR!
npm ERR! Failed at the browser@0.0.1 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\admin\AppData\Roaming\npm-cache\_logs\2020-05-20T07_17_22_879Z-debug.log

解决方法：

npm install cross-env

然后修改package.json中

  "scripts": {
    "test": "jest",
    "dev": "NODE_ENV=dev webpack-dev-server --devtool cheap-module-eval-source-map --progress --colors --hot --content-base dev",
    "build": "NODE_ENV=dev node build.js",
    "release": "NODE_ENV=production MINIO_UI_BUILD=RELEASE node build.js",
    "format": "esformatter -i 'app/**/*.js'"
  }

将dev值的NODE_ENV前面添加 cross-env，修改后为

  "scripts": {
    "test": "jest",
    "dev": "cross-env NODE_ENV=dev webpack-dev-server --devtool cheap-module-eval-source-map --progress --colors --hot --content-base dev",
    "build": "NODE_ENV=dev node build.js",
    "release": "NODE_ENV=production MINIO_UI_BUILD=RELEASE node build.js",
    "format": "esformatter -i 'app/**/*.js'"
  }

再次 npm run dev 即可。