一定不要執行npm i XXX -g(-d) 一定要指定版本，儘量低版本，也不最新版本，會導致不相容和指令不一樣的問題。
1.安裝webpack-dev-server 報錯，說需要webpack-cli，原因，這兩個之中某一個版本太高。，重新安裝低版本
2.安裝webpack-cli ，然後還是不能使用，
3. npm WARN webpack-cli@3.0.8 requires a peer of webpack@^4.x.x but none is installed. You must install peer dependencies yourself.。。說明安裝的Webpack版本太高，切換到，---》》》》》》》》》"webpack": "^3.6.0",
4.最後安裝 "webpack-cli": "^3.0.0",
5.安裝"webpack-dev-server": "^2.9.1"
報錯總結：
【1】
npm WARN webpack-cli@3.0.8 requires a peer of webpack@^4.x.x but none is installed. You must install peer dependencies yourself.
【2】
npm WARN webpack-dev-middleware@3.1.3 requires a peer of webpack@^4.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN webpack-dev-server@3.1.4 requires a peer of webpack@^4.0.0-beta.1 but none is installed. You must install peer dependencies yourself.
【3】
C:\Apache24\htdocs\example\Aproject\test\first-day\Vue-study\02-day\web-pack
> webpack-dev-server
The CLI moved into a separate package: webpack-cli.
Please install 'webpack-cli' in addition to webpack itself to use the CLI.
-> When using npm: npm install webpack-cli -D
-> When using yarn: yarn add webpack-cli -D
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作者：不正經的前端程式設計師
來源：CSDN
原文：https://blog.csdn.net/qq_27300101/article/details/80932670?utm_source=copy
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