React Router 4.0 （以下簡稱 RR4） 已經正式發布，它遵循React的設計理念，即萬物皆組件。

初始化項目啟動之後：

查看相關的配置：npm run eject

查看下package.json中是不是有

"react-router-dom": "^4.2.2"

如下圖配置路由 引入 BrowserRouter ,Route ,Switch

import React from ‘react‘;
import ReactDOM from ‘react-dom‘;
import { BrowserRouter ,Route ,Switch } from ‘react-router-dom‘;
import ‘./index.css‘;
import App from ‘./App‘;
import registerServiceWorker from ‘./registerServiceWorker‘;

ReactDOM.render(
    <div>
        <BrowserRouter>
            <Switch>
                <Route path=‘/‘ component={App} exact />
            </Switch>
        </BrowserRouter>
    </div>
    , document.getElementById(‘root‘));
registerServiceWorker();

初步學習React Router 4.0