Reactjs 反应npm启动不'；创建react应用程序后无法工作

我正在学习英语，我的英语很差。我已经有两个react项目，但它们也不起作用：（我遵循以下步骤

npx创建反应应用程序我的应用程序 cd我的应用程序 npm启动

但它不起作用。我再次尝试清理缓存和npm安装，但没有成功。我如何解决这个问题

> my-app@0.1.0 start /Users/edu/Documents/htdocs/my-app
> react-scripts start


There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix locally.

The react-scripts package provided by Create React App requires a dependency:

  "babel-loader": "8.0.5"

Don't try to install it manually: your package manager does it automatically.
However, a different version of babel-loader was detected higher up in the tree:

  /Users/edu/node_modules/babel-loader (version: 8.1.0) 

Manually installing incompatible versions is known to cause hard-to-debug issues.

If you would prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
That will permanently disable this message but you might encounter other issues.

To fix the dependency tree, try following the steps below in the exact order:

  1. Delete package-lock.json (not package.json!) and/or yarn.lock in your project folder.
  2. Delete node_modules in your project folder.
  3. Remove "babel-loader" from dependencies and/or devDependencies in the package.json file in your project folder.
  4. Run npm install or yarn, depending on the package manager you use.

In most cases, this should be enough to fix the problem.
If this has not helped, there are a few other things you can try:

  5. If you used npm, install yarn (http://yarnpkg.com/) and repeat the above steps with it instead.
     This may help because npm has known issues with package hoisting which may get resolved in future versions.

  6. Check if /Users/edu/node_modules/babel-loader is outside your project directory.
     For example, you might have accidentally installed something in your home folder.

  7. Try running npm ls babel-loader in your project folder.
     This will tell you which other package (apart from the expected react-scripts) installed babel-loader.

If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
That would permanently disable this preflight check in case you want to proceed anyway.

P.S. We know this message is long but please read the steps above :-) We hope you find them helpful!

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!     /Users/edu/.npm/_logs/2020-09-17T00_43_20_777Z-debug.log

也许可以试试：

npm cache clean

npm install

npm create-react-app my-app

cd my-app

npm run start

---

请看一下输出中的建议6

检查/Users/edu/node_modules/babel loader是否在项目目录之外。 例如，您可能意外地在主文件夹中安装了某些内容

听起来好像在某个时候，您意外地在主文件夹（

/Users/edu/

）而不是项目文件夹中安装了npm，而您的项目正依赖于此

修复方法是从

/Users/edu/

中删除node_模块、package.json和package-lock.json，这些模块不需要存在

---

对于其他谷歌用户：上述修复可能无法解决您的特定问题-通读错误消息，看看其他建议是否有帮助。通常错误消息都是无用的，但偶尔会有人花时间写一些有用的东西。这是一个很好的解决方案rors.

@DacreDenny你能看一看吗？除此之外还有其他输出吗？@ScottyJamison我更新了，你能看到吗？是的，谢谢你，这也帮助了很多人。从1-7开始运行上面提到的步骤可能是一个很好的开始。问题是一个名为babel-loader的依赖项。非常感谢！我已经工作了几个小时，我快要发疯了：）嗨，npm开始工作，但npm运行构建现在不工作。你知道吗？@paws我脑子里没有任何建议。请随意打开一个新问题，如果需要，您可以在这个评论线程中添加一个指向它的链接，这样我也可以查看它。