npm ERR! missing script: start npm ERR! A complete log of this run

can be found in: npm ERR!

C:\Users\Administrator\AppData\Roaming\npm-cache_logs\2017-11-20T09_43_06_459Z-debug.log

哎，粗心！！！

npm run start 或者 npm run-script start需要在package.json的 scripts 中定义start为字段的命令

  "scripts": {
    "start": "webpack-dev-server --hot"
  },