react-redux项目里使用（一天一个问题6）

react-redux主要结构

多actions

action具体

reducer

具体reducer

store

代码

一、顶层绑定store

import React from "react"
import ReactDOM from 'react-dom'
import App from './App.js'

import { Provider } from 'react-redux' //将store传递下去
import Store from "./store/index";

ReactDOM.render(
    <Provider store={Store}>
        <App></App>
    </Provider>
,document.getElementById('root'))

说明：

1.Provider 将react-redux数据仓库由顶级组件传递下去
2.Store数据仓库

二、Store数据仓库创建

import {createStore,applyMiddleware} from "redux";
import Immutable from 'immutable';
import thunk from "redux-thunk";
import reducers from "../reducers";

function configStore (){
    const initialState = Immutable.Map();
    let createStoreWithMiddleware = applyMiddleware(thunk)(createStore);
    //dev环境开启redux调试
    let store  = createStoreWithMiddleware(reducers,initialState,(window.__REDUX_DEVTOOLS_EXTENSION__ ? window.__REDUX_DEVTOOLS_EXTENSION__() : undefined));
    return store;
};
export default configStore();

三、合并所有的reducers导出

// import {combineReducers} from "redux"; //combinReducers用于合并各模块的reducers;
import { combineReducers } from 'redux-immutable';
//import logSlowReducers from 'redux-log-slow-reducers';
import reducer1 from "./reducer1";
import reducer2 from "./reducer2";

export default combineReducers({
    reducer1,
    reducer2
});

四、导出所有的actions

import {plus,reduce} from "./common";
let actions = {
    plus,
    reduce
};
export default actions;

五、组件中使用

import React, { Component } from 'react';
import { connect } from 'react-redux';
import {bindActionCreators} from 'redux';
import actions from './actions';

class Count extends Component{
    componentDidMount(){
        console.log(this.props)
    }
    render(){
        const {initState}=this.props;
        const { plus,reduce} = this.props.ACTIONS;
        return (
            <div className="a">
                <h2>当月工资为{initState}</h2>
                <button onClick={plus}>升职加薪</button>
                <button onClick={reduce}>迟到罚款</button>
            </div>
        )
    }
}

function mapStateToProps(state){
    console.log(state)
    console.log(state.get())
    const state1 = state.get("reducer1")//获取某个reducer
    return{
        initState:state1.get("num1")//获取对应reducer的数据
    }
}

//需要触发什么行为-将dispatch转成props
function mapDispatchToProps(dispatch){
    return {
       ACTIONS:bindActionCreators(actions,dispatch)//bindActionCreators的作用是将一个或多个action和dispatch组合起来生成mapDispatchToProps需要生成的内容。
    }
}

export default connect(mapStateToProps,mapDispatchToProps)(Count)

解读：

1.connect传入两个函数mapStateToProps，mapDispatchToProps将组件和store联系起来
2.mapStateToProps//将state转成props；//获取对应reducer里面的state对象，再获取具体的值
3.页面中使用获取到的state值，需要将值结构出来 const {initState}=this.props;
4.mapDispatchToProps //将dispatch转成props,获取所有的action
5.使用action需要解构出来 const { plus,reduce} = this.props.ACTIONS;
6.bindActionCreators将所有的action组合起来

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