1、安装redux-thunk
npm install redux-thunk

npm install redux-thunk

2、redux/store.js
引入redux-thunk

/*该文件专门用于创建一个为Count组件服务的store对象*/
//引入createStore,专门创建redux中最为核心的store对象
import {createStore,applyMiddleware} from 'redux'
//引入cunter.redux.js文件
import countReducer from './count_reducer'
//引入redux-thunk用于支持异步action
import {thunk} from 'redux-thunk'
//暴露store
export default createStore(countReducer,applyMiddleware(thunk))

3、redux/count_action.js

/*该文件专门为Count组件生成action对象*/
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,就是形参为data，返回值为action对象
export const createDecrementAction = data=>({type:DECREMENT,data})// export default {
//     createIncrementAction,
//     createDecrementAction
// }
//所谓的异步action，就是指action的值为函数,异步action中一般都会调用同步action，异步action不是必须要用的
export const createIncrementAsyncAction = (data,time)=>{return ()=>{setTimeout(()=>{//通知reduxstore.dispatch(createIncrementAction(data))},time)}
}

4、调用

import React, {Component} from "react";
//引入store,用于获取数据
import store from '../../redux/store'
//引入actionCreator 专门创建action对象
import {createDecrementAction,createIncrementAction,createIncrementAsyncAction} from '../../redux/count_action'export default class Count extends Component {state = {count:store.getState()}componentDidMount() {//监测redux中的数据的变化，只要改变，就会调用renderstore.subscribe(()=>{this.setState({count:store.getState()})})}//加法increment=()=>{const {value} = this.selectNum//通知redux 改变// store.dispatch({type:'increment',data:parseInt(value)})store.dispatch(createIncrementAction(parseInt(value)))}//减法decrement=()=>{const {value} = this.selectNumstore.dispatch(createDecrementAction(parseInt(value)))}//奇数加incrementIfOdd=()=>{const {value} = this.selectNumconst {count} = this.stateif(count%2!==0){store.dispatch(createIncrementAction(parseInt(value)))}}//异步加incrementAsync=()=>{const {value} = this.selectNum// setTimeout(()=>{store.dispatch(createIncrementAsyncAction(parseInt(value),500))// },500)}render(){return(<div><h1>当前求和为：{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}>当前求和为奇数在加</button>&nbsp;<button onClick={this.incrementAsync}>异步加</button>&nbsp;</div>);}}