[toc] ### 引入store ``` import {createStore, applyMiddleware} from 'redux' import reducer from './reducer' import thunk from 'redux-thunk' // 引入后 action 可以 return 一個方法，否則只能是對象 import { createLogger } from 'redux-logger' // 查看 store const store = createStore( reducer, applyMiddleware(thunk, createLogger()), ); // 創建數據倉庫 store.getState() // 獲取 state 值 store.dispatch(action) // 直接dispatch action export default store; ``` ### action action的兩種寫法，引入中間件 thunk前，返回一個對象, store.dispatch(action) ``` export const getInputChangeAction = (value) => ({ type: CHANGE_INPUT_VALUE, value }) const action = getInputChangeAction(e.target.value) store.dispatch(action) ``` 引入 thunk 后，可以返回一個方法，thunk相當于給 dispatch 做了升級 ``` const action = getTodoList() store.dispatch(action) // 直接執行，action 中的方法，其中方法中默認有一個dispatch，用來傳遞給 action export const getTodoList = () => { return (dispatch) => { axios.get('http://127.0.0.1:3001/test').then(res => { const action = initListAction(res.data) dispatch(action) }) } } export const initListAction = (data) => ({ type: INIT_LIST_ACTION, data }) ``` ### reducer ``` if (action.type === ADD_TODO_ITEM) { const newState = JSON.parse(JSON.stringify(state)) newState.list.push(newState.inputValue) newState.inputValue = ''; return newState } ```