javascript - react js如何修改默认端口

Question

我可以使用默认端口 3000 启动 react js。但是，当我将端口自定义为 4200 "start": "PORT=4200 react-scripts start"（只是在 package.json 中更改）时，我无法启动 react js 应用程序。

'PORT' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! todo-app@0.1.0 start: `PORT=4200 react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the todo-app@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional lo
ging output above.

npm ERR! A complete log of this run can be found in:

标签： javascriptnode.jsreactjscreate-react-app

Answer 1

要在另一个端口上启动 APP，请运行以下 npm 命令

npm start --port 3002

或在包使用中进行配置

用下面的替换启动命令

"start": "set PORT=3006 && react-scripts start"