一个解决方案:

删除“node_modules”文件夹。在包装里。Json文件，更改react-router-dom版本(在我的情况下版本6)为“react-router-dom”:“^5.2.1”

然后在终端运行:

NPM install用于安装依赖项，然后运行 NPM开始重新启动

<Switch>替换为<Routes>

之前:

import { Route, Switch} from 'react-router'

<Router>
    <Switch>
        <Route />
        <Route />
    </Switch>
</Router>

Now:

import { Route, Routes} from 'react-router'

<Router>
    <Routes>
        <Route />
        <Route />
    </Routes>
</Router>

只需使用路由而不是交换机。

这是一个使用react-router-dom V6的例子

import React from 'react'
import { BrowserRouter as Router, Route, Routes } from 'react-router-dom'

import '../styles/global.css'

import Layout from '../containers/Layout'
import Home from '../pages/Home'
import Login from '../containers/Login'
import RecoveryPassword from '../containers/RecoveryPassword'
import NotFound from '../pages/NotFound'

const App = () => {
  return (
    <Router>
      <Layout>
        <Routes>
          <Route exact path="/" element={<Home/>}/>
          <Route exact path="/login" element={<Login/>}/>
          <Route exact path="/recovery-password" element={<RecoveryPassword/>}/>
          <Route path="*" element={<NotFound/>}/>
        </Routes>
      </Layout>
    </Router>
  );
}

export default App;

你的react-router-dom版本是什么?

"react-router": "^5.2.0",
"react-router-dom": "^5.2.0",

如果它大于1，那么你需要删除node-modules并使用npm install——save重新安装node-module。

在react-router-dom v6中，开关被路由替换。下面是配置react-router-dom v6的简单示例。

import * as React from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';

import Layout from './components/Layout';
import ProtectedRoute from './components/ProtectedRoute';
import LoginPage from './pages/LoginPage';
import WizardPage from './pages/WizardPage';
import RequestsPage from './pages/RequestsPage';

import './App.scss'

export class App extends React.Component {
    public render() {
        const sharedRouteProps = { exact: true, authenticationPath: '/login' };
        const wizardRouteProps = { ...sharedRouteProps, path: "/", component: WizardPage };
        const requestsRouteProps = { ...sharedRouteProps, path: "/requests", component: RequestsPage };

        return (
            <Layout>
              <Router>
                <Switch>
                    <Route exact path='/login' component={LoginPage} />
                    <ProtectedRoute {...wizardRouteProps} />
                    <ProtectedRoute {...requestsRouteProps} />
                </Switch>
              </Router>
            </Layout>
        );
    }
}

在安装react-router-dom v6.0.2后，我得到了这个错误。

用路由替换交换机解决了这个问题:

import {BrowserRouter as Router, Route, Routes} from "react-router-dom";