npm 开始给出错误答案

【问题标题】：npm start giving errorsnpm 开始给出错误
【发布时间】：2020-06-21 19:03:53
【问题描述】：

我正在尝试使用 NPX create react app 创建一个 react 应用程序，并且 npm install 运行良好，但是应该运行代码的 npm start 给出了错误。

这是错误

> react-scripts start

i ｢wds｣: Project is running at http://10.54.83.144/
i ｢wds｣: webpack output is served from
i ｢wds｣: Content not from webpack is served from C:\Users\xyz\Desktop\app\my-app\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! my-app@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-app@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\xyz\AppData\Roaming\npm-cache\_logs\2020-03-09T20_33_16_720Z-debug.log

这是 package.json

{
  "name": "my-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "react": "^16.13.0",
    "react-dom": "^16.13.0",
    "react-scripts": "^3.4.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

这里是完整的调试日志文件。

0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli   'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Users\\xyz\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'start'
1 verbose cli ]
2 info using npm@6.14.2
3 info using node@v12.16.1
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle my-app@0.1.0~prestart: my-app@0.1.0
6 info lifecycle my-app@0.1.0~start: my-app@0.1.0
7 verbose lifecycle my-app@0.1.0~start: unsafe-perm in lifecycle true
8 verbose lifecycle my-app@0.1.0~start: PATH: C:\Users\xyz\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;C:\Users\xyz\Desktop\app\my-app\node_modules\.bin;C:\Program Files (x86)\RSA SecurID Token Common;C:\Program Files\RSA SecurID Token Common;C:\apache\maven3.6.1\bin;C:\Program Files\Java\jdk1.8.0_241\bin;C:\Program Files\nodejs\;C:\Users\xyz\AppData\Local\Microsoft\WindowsApps;;C:\Users\xyz\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\xyz\AppData\Roaming\npm
9 verbose lifecycle my-app@0.1.0~start: CWD: C:\Users\xyz\Desktop\app\my-app
10 silly lifecycle my-app@0.1.0~start: Args: [ '/d /s /c', 'react-scripts start' ]
11 silly lifecycle my-app@0.1.0~start: Returned: code: 1  signal: null
12 info lifecycle my-app@0.1.0~start: Failed to exec start script
13 verbose stack Error: my-app@0.1.0 start: `react-scripts start`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (C:\Users\xyz\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\index.js:332:16)
13 verbose stack     at EventEmitter.emit (events.js:311:20)
13 verbose stack     at ChildProcess.<anonymous> (C:\Users\xyz\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at ChildProcess.emit (events.js:311:20)
13 verbose stack     at maybeClose (internal/child_process.js:1021:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
14 verbose pkgid my-app@0.1.0
15 verbose cwd C:\Users\xyz\Desktop\app\my-app
16 verbose Windows_NT 10.0.17763
17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\xyz\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "start"
18 verbose node v12.16.1
19 verbose npm  v6.14.2
20 error code ELIFECYCLE
21 error errno 1
22 error my-app@0.1.0 start: `react-scripts start`
22 error Exit status 1
23 error Failed at the my-app@0.1.0 start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

我尝试删除节点模块并删除缓存，然后再次使用NPM INSTALL 但它们不起作用。我在这里缺少什么？

【问题讨论】：

您似乎在呼叫react-scripts start，而不是npm start。除此之外，这看起来像 Using nodejs's spawn causes "unknown option -- " and "[Error: spawn ENOENT]" errors 的副本，因为您试图通过 spawn 在 Windows 上运行 npm，但您忘记告诉 Node 使用 npm.cmd（因为“npm”不是 Windows 上的可执行文件)
我在终端上使用了 npm start @Mike 'Pomax' Kamermans
那么看起来react-scripts 的创建者忘记了 Windows 的存在，您可能应该在他们的问题跟踪器上提交一个错误（在搜索它之后，以确保它不是一个已知问题，使用已知的解决方法）
尝试安装/更新 nodejs 之类的东西，并确保它们已更新。 sudo apt-get update nodejs（可能是node.js）你也可以试试npm update

标签： reactjs npm react-redux npm-start

【解决方案1】：

解决方案 1

将环境变量设置为 C:\Windows\System32。

解决方案 2

如果第一个不起作用，请执行第二个步骤。导航到您的项目文件夹并输入此命令 >>>

rm -rf node_modules

rm package-lock.json

rm yarn.lock

npm cache clear --force

npm install

解决方案 3

在 package.json 文件中降级 react-scripts

【讨论】：

【解决方案2】：

我想说首先尝试下面的代码来创建一个 npm 项目和你的 react 应用程序，然后一旦启动，你可以尝试根据你的需要修改 package.json

npx create-react-app my-app cd 我的应用程序 npm 开始

【讨论】：

我没有修改我的 package.json。我刚刚使用 npx create-react-app my-app cd my-app npm start 正如你所说，它给出了这个错误。