学员所做：用 umi + dva + MongoDB + Mongoose 实现注册登录功能 https://github.com/sphawkcn/umiLogin

这一节很简单，直接按着命令和代码操作就可以。

src/index.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './components/App';
import { Provider } from 'react-redux';
import registerServiceWorker from './registerServiceWorker';

import { createStore, applyMiddleware } from 'redux';
import rootReducer from './reducers';
import { composeWithDevTools } from 'redux-devtools-extension';
import logger from 'redux-logger';

const store = createStore(
  rootReducer,
  composeWithDevTools(
    applyMiddleware(logger)
  )
);

ReactDOM.render(
  <Provider store={ store }>
    <App />
  </Provider>,
  document.getElementById('root')
);
registerServiceWorker();

src/components/App.js

import React, { Component } from 'react';

class App extends Component {
  render() {
    return (
      <div>
        Home
      </div>
    );
  }
}

export default App;

src/reducers/games.js

const games = (state = [], action = {}) => {
  switch(action.type) {
    default: return state;
  }
}

export default games;

src/reducers/index.js

import { combineReducers } from 'redux';

import games from './games';

export default combineReducers({
  games
});