1、安裝redux-thunk
npm install redux-thunk

npm install redux-thunk

2、redux/store.js
引入redux-thunk

/*該文件專門用于創建一個為Count組件服務的store對象*/
//引入createStore,專門創建redux中最為核心的store對象
import {createStore,applyMiddleware} from 'redux'
//引入cunter.redux.js文件
import countReducer from './count_reducer'
//引入redux-thunk用于支持異步action
import {thunk} from 'redux-thunk'
//暴露store
export default createStore(countReducer,applyMiddleware(thunk))

3、redux/count_action.js

/*該文件專門為Count組件生成action對象*/
import {INCREMENT,DECREMENT} from './constant'
import store from "./store";
// function createIncrementAction(data){
//     return {type:'increment',data}
// }
export const createIncrementAction = data=>({type:INCREMENT,data})
// function createDecrementAction(data){
//     return {type:'decrement',data}
// }
//同步action,就是形參為data，返回值為action對象
export const createDecrementAction = data=>({type:DECREMENT,data})// export default {
//     createIncrementAction,
//     createDecrementAction
// }
//所謂的異步action，就是指action的值為函數,異步action中一般都會調用同步action，異步action不是必須要用的
export const createIncrementAsyncAction = (data,time)=>{return ()=>{setTimeout(()=>{//通知reduxstore.dispatch(createIncrementAction(data))},time)}
}

4、調用

import React, {Component} from "react";
//引入store,用于獲取數據
import store from '../../redux/store'
//引入actionCreator 專門創建action對象
import {createDecrementAction,createIncrementAction,createIncrementAsyncAction} from '../../redux/count_action'export default class Count extends Component {state = {count:store.getState()}componentDidMount() {//監測redux中的數據的變化，只要改變，就會調用renderstore.subscribe(()=>{this.setState({count:store.getState()})})}//加法increment=()=>{const {value} = this.selectNum//通知redux 改變// store.dispatch({type:'increment',data:parseInt(value)})store.dispatch(createIncrementAction(parseInt(value)))}//減法decrement=()=>{const {value} = this.selectNumstore.dispatch(createDecrementAction(parseInt(value)))}//奇數加incrementIfOdd=()=>{const {value} = this.selectNumconst {count} = this.stateif(count%2!==0){store.dispatch(createIncrementAction(parseInt(value)))}}//異步加incrementAsync=()=>{const {value} = this.selectNum// setTimeout(()=>{store.dispatch(createIncrementAsyncAction(parseInt(value),500))// },500)}render(){return(<div><h1>當前求和為：{store.getState()}</h1><select ref={(c)=>this.selectNum=c}><option value="1">1</option><option value="2">2</option><option value='3'>3</option></select>&nbsp;<button onClick={this.increment}>+</button>&nbsp;<button onClick={this.decrement}>-</button>&nbsp;<button onClick={this.incrementIfOdd}>當前求和為奇數在加</button>&nbsp;<button onClick={this.incrementAsync}>異步加</button>&nbsp;</div>);}}