~~~ yarn add redux ~~~  ## 1.在store文件下新建一個`index.js`的文件 管理數據 ~~~ import {createStore} from 'redux'; import reducer from './reducer'; const store = createStore(reducer); export default store; ~~~ ## 2.創建一個`reducer.js`取存儲數據 ~~~ const defaultState={ inputValue:'', list:[] }; /* state指store中的數據 */ export default (state=defaultState,action)=>{ return state; } ~~~ ## 3.在App.js中導入store ~~~ import store from './store'; class App extends Component { constructor(props){ super(props); //getState()可以獲取state中的數據 console.log(store.getState()) this.state = store.getState(); } } ~~~