- public/index.html
<!DOCTYPE html>
<html><head><meta charset="UTF-8"><title>redux</title></head><body><div id="root"></div></body>
</html>- src/App.jsx
import React, {Component} from 'react';
import Count from "./containers/Count"; // 引入的Count的容器组件
import Person from "./containers/Person"; // 引入的Person的容器组件class App extends Component {render() {return (<div><Count/><hr/><Person/></div>);}
}export default App;- src/index.js
import React from "react";
import ReactDOM from 'react-dom'
import App from './App'import store from './redux/store'
import {Provider} from 'react-redux'ReactDOM.render(/* 此处需要用Provider包裹App,目的是让App所有的后代容器组件都能接收到store */<Provider store={store}><App/></Provider>,document.getElementById('root')
)- src/redux/constant.js
/*** 该模块是用于定义action对象中type类型的常量值,目的只有一个：* 便于管理的同时防止程序员单词写错*/
export const INCREMENT = 'increment'
export const DECREMENT = 'decrement'export const ADD_PERSON = 'addperson'- src/redux/store.js
/*
* 该文件专门用于暴露一个store对象，整个应用只有一个store对象
* */// store.js
//引入createStore，专门用于创建redux中最为核心的store对象
import {createStore,applyMiddleware} from 'redux'
//引入redux-thunk，用于支持异步action
import {thunk} from 'redux-thunk'
//引入redux-devtools-extension
import { composeWithDevTools } from '@redux-devtools/extension';
// 引入汇总之后的reducer
import reducer from "./reducers";
//导出store
export default createStore(reducer,composeWithDevTools(applyMiddleware(thunk)))(1).Count组件相关的
- src/containers/Count/index.jsx
import React, {Component} from 'react';
// 引入action
import {decrement,increment,incrementAsync
} from '../../redux/actions/count'// 引入connect用于连接UI组件与redux
import {connect} from 'react-redux'// 定义UI组件
class Count extends Component {// count已经交给了redux去管理了state = {carName:'奔驰c63'}// 加法increment=()=>{const {value} = this.selectNumberthis.props.increment(value*1)}// 减法decrement=()=>{const {value} = this.selectNumberthis.props.decrement(value*1)}// 奇数再加incrementIfOdd=()=>{const {value} = this.selectNumberif(this.props.count %2 !== 0) {this.props.increment(value*1)}}// 异步加incrementAsync=()=>{const {value} = this.selectNumberthis.props.incrementAsync(value*1,500)}render() {return (<div><h2>我是Count组件,下方组件总人数为:{this.props.personCount}</h2><h4>当前求和为：{this.props.count}</h4><select ref={c => this.selectNumber = c}><option value="1">1</option><option value="2">2</option><option value="3">3</option></select> <button onClick={this.increment}>+</button> <button onClick={this.decrement}>-</button> <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button> <button onClick={this.incrementAsync}>异步加</button> </div>);}
}// 使用connect()()创建并暴露一个Count的容器组件
export default connect(state =>({count:state.count,personCount:state.personList.length}),// mapDispatchToProps的精简写法{ increment,decrement,incrementAsync }
)(Count)- src/redux/actions/count.js
/*
* 该文件专门为Count组件生成action对象
* */
import {INCREMENT,DECREMENT} from '../constant'// 版本2
// 同步action，就是指action的值为Object类型的一般对象
export const increment = data => ({type:INCREMENT,data})
export const decrement = data => ({type:DECREMENT,data})// 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 incrementAsync = (data,time) => {return (dispatch)=>{setTimeout(()=>{dispatch(increment(data))},time)}
}
- src/redux/reducers/count.js
/*
* 1.该文件是用于创建一个为Count组件服务的reducer,reducer的本质就是一个函数
* 2.reducer函数会接到两个参数，分别为: 之前的状态（preState），动作对象(action)
* */
import {INCREMENT,DECREMENT} from '../constant'// 初始化版本2
const initState = 0
export default function countReducer(preState=initState,action) {// 从action对象中获取：type,dataconst {type,data} = action// 根据type决定如何加工数据switch (type) {case INCREMENT: // 如果是加return preState + datacase DECREMENT: // 如果是减return preState - datadefault:return preState}
}(2).Person组件相关的
- src/containers/Person/index.jsx
import React, {Component} from 'react';
import {nanoid} from 'nanoid'
import {connect} from 'react-redux'
import {addPerson} from "../../redux/actions/person";class Person extends Component {addPerson = ()=>{const name = this.nameNode.valueconst age = this.ageNode.value*1const personObj = {id:nanoid(),name,age}this.props.addPerson(personObj)this.nameNode.value = ''this.ageNode.value = ''}render() {return (<div><h2>我是Person组件,上方组件求和为{this.props.count}</h2><input ref={c=>this.nameNode = c} type="text" placeholder="输入名字"/> <input ref={c=>this.ageNode = c} type="text" placeholder="输入年龄"/> <button onClick={this.addPerson}>添加</button><ul>{this.props.personList.map((p)=>{return <li key={p.id}>名字{p.name}---年龄{p.age}</li>})}</ul></div>);}
}export default connect(state => ({personList:state.personList,count:state.count}), // 映射状态{addPerson}// 映射操作状态的方法
)(Person)- src/redux/actions/person.js
import {ADD_PERSON} from "../constant";// 创建增加一个人的action动作对象
export const addPerson = personObj=>({type:ADD_PERSON,data:personObj})- src/redux/reducers/person.js
import {ADD_PERSON} from "../constant";// reducer就是专门初始化和加工状态的// 初始化人的列表
const initState = [{id:'001',name:'tom',age:18}]
export default function personReducer(preState=initState,action) {const {type,data}= actionswitch (type) {case ADD_PERSON: // 若是添加一个人// preState.unshift(data) // 此处不可以这样写，这样会导致preState被改写了，personReducer就不是纯函数了，就会影响redux不能够识别状态的改变return [data,...initState] // 把新加的人放前边default:return preState}
}- 该文件用于汇总所有的reducer为一个总的reducer：src/redux/reducers/index.js
/*
* 该文件用于汇总所有的reducer为一个总的reducer
* */
// 引入combineReducers,用于汇总多个reducer
import {combineReducers} from 'redux'
//引入为Count组件服务的reducer
import count from './count'
//引入为Person组件服务的reducer
import personList from './person'// 汇总所有的reducer变为一个总的reducer
export default combineReducers({count,personList
})## 8.求和案例_react-redux最终版(1).所有变量名字要规范，尽量触发对象的简写形式(2).reducers文件夹中，编写index.js专门用于汇总并暴露所有的reducer
