尝试运行 npm start 命令时出错答案

【问题标题】：Error when trying to run npm start command尝试运行 npm start 命令时出错
【发布时间】：2020-12-18 23:58:36
【问题描述】：

我正在尝试创建一个反应项目，我已经运行了 npx create-react-app hello-react --use-npm 然后 cd hello-react 但是当我运行 npm start 时显示此错误：

npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path C:\Users\develompent\Desktop\react\package.json
npm ERR! errno -4058
npm ERR! enoent ENOENT: no such file or directory, open 'C:\Users\develompent\Desktop\react\package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\develompent\AppData\Roaming\npm-cache\_logs\2020-08-30T18_43_59_773Z-debug.log

C:\Users\develompent\Desktop\react>cd hello-react

C:\Users\develompent\Desktop\react\hello-react>npm start

> hello-react@0.1.0 start C:\Users\develompent\Desktop\react\hello-react
> react-scripts start

i ｢wds｣: Project is running at http://192.168.137.1/
i ｢wds｣: webpack output is served from
i ｢wds｣: Content not from webpack is served from C:\Users\develompent\Desktop\react\hello-react\public
i ｢wds｣: 404s will fallback to /
Starting the development server...

events.js:292
      throw er; // Unhandled 'error' event
      ^

Error: spawn powershell 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 powershell',
  path: 'powershell',
  spawnargs: [
    '-NoProfile',
    '-NonInteractive',
    '–ExecutionPolicy',
    'Bypass',
    '-EncodedCommand',
    'UwB0AGEAcgB0ACAAIgBgACIAaAB0AHQAcAA6AC8ALwBsAG8AYwBhAGwAaABvAHMAdAA6ADMAMAAwADAAYAAiACIA'
  ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! hello-react@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the hello-react@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\develompent\AppData\Roaming\npm-cache\_logs\2020-08-30T18_44_47_550Z-debug.log

我试图删除 node_modules 然后我再次安装它但同样的问题仍然发生我也尝试以管理员身份运行 cmd，但它没有打开而没有显示任何错误

【问题讨论】：

标签： reactjs npm cmd npm-start

【解决方案1】：

创建一个新文件夹并尝试以下操作：

npx create-react-app my-app
cd my-app
npm start

您的机器上需要有 Node >= 8.10 和 npm >= 5.6

https://reactjs.org/docs/create-a-new-react-app.html

【讨论】：

【解决方案2】：

你可以尝试在C:\windows\System32路径下重新安装node

或者你可以

按照以下步骤操作：

npm cache clean --force
删除node_modules文件夹
删除package-lock.json文件
npm install

【讨论】：

【解决方案3】：

使用这些命令降级项目的反应脚本

npm install react-scripts@2.1.8
npm start

【讨论】：