create-react-app降低react的版本

react最近不是出18了嗎

但問題是很多的庫都還不支持

而且工作中不會使用特別新的技術

但用create-react-app創(chuàng)建的項目默認為react18版本

這里我們降版本只需要一行命令

npm install react@17.x react-dom@17.x --save

這里有個坑，這兩個要同時降!!!，只改一個會報錯!!!

順便提醒一下，報錯雖然長,但可以用翻譯軟件翻譯一下，我這里也是通過看翻譯之后的報錯才注意到這個問題。

本來很簡單的問題，我搞了一個多小時~

create-react-app npm start解決webpack版本過高導致的報錯

PS E:\HtmlProject\react\reactProject\react_staging> npm start

> react_staging@0.1.0 start
> 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:

  "webpack": "4.44.2"

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

  E:\HtmlProject\react\reactProject\react_staging\node_modules\webpack (version: 5.55.0)

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 "webpack" 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.

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 E:\HtmlProject\react\reactProject\react_staging\node_modules\webpack is outside your project directory.
     For example, you might have accidentally installed something in your home folder.

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

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 start報錯上面的錯誤

查找了很久網(wǎng)上的解決方法，其中嘗試了錯誤里建議創(chuàng)建.env文件的方法，但是還是會報錯，報錯里說

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

  "webpack": "4.44.2"

但是我們的項目路徑下的webpack是

 E:\HtmlProject\react\reactProject\react_staging\node_modules\webpack (version: 5.55.0)
```版本不一致

``## ## 解決方法

既然它需要4.44.2的版本，那我們直接在該項目路徑下卸載原來的版本`

npm uninstall webpack
安裝它需要的版本
npm install --save-dev webpack@4.44.2

這樣就可以了

總結

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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