解决：引入Routes用来包裹Route

import { Route, Routes } from 'react-router-dom'
<Routes>
    <Route xxx />
    <Route xxx />
</Routes>

解决：使用element属性，值为标签

<Routes>
    <Route path='/about' element={<About/>} />
    <Route path='/home' element={<Home/>} />
</Routes>