一開始裝webpack建議先裝低一點版本，所以npm i -D [email protected] 裝了個3.12版本的,然後裝了webpack-dev-server

配置如下：

{
  "name": "WebPack",
  "version": "1.0.0",
  "description": "",
  "main": "webpack.config.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "webpack",
    "start"
 
: "webpack-dev-server"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.4",
    "babel-preset-react": "^6.24.1",
    "html-webpack-plugin": "^3.2.0",
    "webpack": "^3.12.0",
    "webpack-dev-server": "^3.1.4"
  },
 
  "dependencies": {
    "react": "^16.4.1",
    "react-dom": "^16.4.1"
  }
}

然後執行npm run start提示要安裝webpack-cli,然後就裝唄 npm i -D webpack-cli,裝出來是

"webpack-cli": "^3.0.8",執行npm run start又報了個錯

> webpack-dev-server

xx/web/node_modules/_webpack-dev-server@3.12@webpack-dev-server/bin/webpack-dev-server.js:405
 

    throw e;
    ^

TypeError: Cannot read property 'compile' of undefined

TypeError: Cannot read property 'compile' of undefined

這個錯誤，同理如果webpack是3.x,則webpack-dev-server必須是2.x 

於是將webpack解除安裝npm uninstall webpack然後再npm install webpack這時候裝上去的預設是最新的版本，我此次裝的是4.14版本，然後再次npm run start就可以正常運行了