我是 React 的新手，正在尝试了解路由。我创建了一个学习项目，并希望渲染三个不同的组件，每个组件都有不同的路径。但是，所有路径都会导致显示 App 组件。

我尝试在多个来源上寻找解决方案，但无法找出问题所在！请看一下。提前致谢。

Root.jsx

import React, { Component } from 'react';
import { Router } from 'react-router';
import { Redirect, Route, Switch } from 'react-router-dom';

import ScreensList from './List';
import ScreensWeather from './Weather';
import App from '../App';

const ScreensRoot = () => (
  <Router>
    <Switch>
        <Route exact path='/' component={App}/>
        <Route path="/list" component={ScreensList} />
        <Route path="/weather" component={ScreensWeather} />
    </Switch>
  </Router>
);

export default ScreensRoot;

App.js

import React, {Component} from 'react';
import './App.css';

class App extends React.Component {
   render(){
      return (
         <div>
            Hello from App!
         </div>
      )
   }
}   

export default App;

List.jsx

import React from 'react';
import List from '../components/List';

const ScreensList = () => (
    <div>
        <List/>
    </div>
);

export default ScreensList;

List.jsx

import React from 'react';

const List = (
    <div>Hello from List Component!</div>
);

export default List;

index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
import './screens/Root';

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

serviceWorker.unregister();