第一步安裝 react-router-config （需要注意不支援 react-router-dom 5以上的版本 ）

yarn add react-router-config

第二步在 react-app-env.d.ts 中宣告引入

/// <reference types="react-scripts" />

declare module 'react-router-config';
declare module 'react-router-dom';

第三步 建立 router 檔案 

import Home from '../pages/Home';

import Login 
 
from '../pages/Login';

const routes: any = [
  {
    path: '/',
    exact: true,
    component: Home,
    routes: []
  },
  {
    path: '/home',
    component: Home,
    routes: []
  },
  {
    path: '/login',
    component: Login,
    routes: []
  }
]

export default routes

第四步在 App.tsx 中引入使用

import { BrowserRouter } from
 
 'react-router-dom';
import { renderRoutes } from "react-router-config";
import routes from "./router";
function App() {
  return (
    <BrowserRouter>
      { renderRoutes(routes) }
    </BrowserRouter>
  );
}
export default App;

第五步在 index.tsx 中展示 App 元件

import React from 'react';
import ReactDOM 
 
from 'react-dom';
import './index.css';
import App from './App';
// 效能檢測工具
import reportWebVitals from './reportWebVitals';


ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
reportWebVitals();

完成以上步驟就能在瀏覽器上自由切換了