"npm start" 不适用于新创建的 React 应用程序

Question

我用npx create-react-app myburger创建了一个react app，然后通过cd myburger进入了项目。之后当我运行命令 npm start 时，显示以下错误：

$ npm start

> myburger@0.1.0 start E:\front-end projects\burger\myburger
> react-scripts start

Starting the development server...

events.js:287
      throw er; // Unhandled 'error' event
      ^

Error: spawn powershell ENOENT
←[90m    at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)←[39m
←[90m    at onErrorNT (internal/child_process.js:469:16)←[39m
←[90m    at processTicksAndRejections (internal/process/task_queues.js:84:21)←[39m
Emitted 'error' event on ChildProcess instance at:
←[90m    at Process.ChildProcess._handle.onexit (internal/child_process.js:273:12)←[39m
←[90m    at onErrorNT (internal/child_process.js:469:16)←[39m
←[90m    at processTicksAndRejections (internal/process/task_queues.js:84:21)←[39m {
  errno: ←[32m'ENOENT'←[39m,
  code: ←[32m'ENOENT'←[39m,
  syscall: ←[32m'spawn powershell'←[39m,
  path: ←[32m'powershell'←[39m,
  spawnargs: [
    ←[32m'-NoProfile'←[39m,
    ←[32m'-NonInteractive'←[39m,
    ←[32m'–ExecutionPolicy'←[39m,
    ←[32m'Bypass'←[39m,
    ←[32m'-EncodedCommand'←[39m,
    ←[32m'UwB0AGEAcgB0ACAAIgBgACIAaAB0AHQAcAA6AC8ALwBsAG8AYwBhAGwAaABvAHMAdAA6ADMAMAAwADAAYAAiACIA'←[39m
  ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! myburger@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the myburger@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\User\AppData\Roaming\npm-cache\_logs20-09-08T15_41_32_469Z-debug.log

我以前的所有项目运行都很好。只有我现在正在创建的新的面临这个问题。我在 32 位 windows 7，使用 vscode 和 bash。谁能提供解决方案？

Answer 1

npm install 你安装了所有 npm 模块了吗？请检查您的文件夹。

Answer 2

我尝试了很多方法，唯一对我有用的方法是降级：npm install react-scripts@2.1.8 Tbh 我不知道它为什么起作用

"npm start" 不适用于新创建的 React 应用程序

"npm start" is not working with newly created react apps

npm

reactjs

create-react-app

npx