使用 React 应用程序启动 npm 时出错

Question

每当我使用npx create-react-app test创建一个新的 React 文件夹时，我都会遇到这个问题。 npm start不起作用并在终端中抛出此错误消息

> test@0.1.0 start C:\Users\franc\Desktop\test
> react-scripts start

i ｢wds｣: Project is running at http://192.168.56.1/
i ｢wds｣: webpack output is served from
i ｢wds｣: Content not from webpack is served from C:\Users\franc\Desktop\test\public
i ｢wds｣: 404s will fallback to /
Starting the development server...

events.js:288
      throw er; // Unhandled 'error' event
      ^

Error: spawn cmd ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)
Emitted 'error' event on ChildProcess instance at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:273:12)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  errno: 'ENOENT',
  code: 'ENOENT',
  syscall: 'spawn cmd',
  path: 'cmd',
  spawnargs: [ '/s', '/c', 'start', '""', '/b', '"http://localhost:3000"' ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! test@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the test@0.1.0 start 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\franc\AppData\Roaming\npm-cache\_logs\2020-03-23T00_10_45_653Z-debug.log

有人知道如何解决吗？

Answer 1

看看你的 package.json 文件夹 test ./test/package.json你会看到这样的：

  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },

如果在那里 run npm run start添加单词run - 还要确保在创建应用程序后 cd 进入测试文件夹。

Answer 2

我通过将C:\\Windows\\System32到环境变量中的 PATH 并重新启动系统来解决我的问题。