一跟着网上做react项目时，代码中以下代码：

import { HashRouter, Route, Switch, Redirect } from 'react-router-dom'

出现了以下俩个报错：

export 'Switch' (imported as 'Switch') was not found in 'react-router-dom'

export 'Redirect' (imported as 'Redirect') was not found in 'react-router-dom'

export 'withRouter' (imported as 'withRouter') was not found in 'react-router-dom'

原因：这些报错原因均为'Switch' 和'Redirect' 是react-router 5版本的接口，而最新版本是

"react-router-dom": "^6.2.1"，并且已经将Switch改为Routes。

解决办法有二：

1.将所有 Switch 改为 Routes，Redirect 改为 Navigate ，withRouter改为 useNavigate 

（vscode中，按快捷键：CTRL+F及可查找替换）

2.卸载新版本，再安装5的版本

npm uninstall react-router-dom
npm install react-router-dom@5