react-redux

安装

• npm i react-redux --save
• 或者 yarn add react-redux

实例

• 这里还是用todoList为例讲解
• 完整目录结构
  

修改index.js 入口文件

import React from 'react';
import ReactDOM from 'react-dom';
import * as serviceWorker from './serviceWorker';
import { Provider } from 'react-redux';
import store from './store/index.js'
import TodoList from './TodoList'
const App = (
    <Provider store={store}>
        <TodoList />
    </Provider>
)
ReactDOM.render(App, document.getElementById('root'));
serviceWorker.unregister();

解释

• 上述Provider 是react-redux的一个核心api，它所包裹的东西都可以共享store数据

TodoList.js的配置

• 先导包import { connect } from 'react-redux'
• 注意最后的导出方式变了

const mapStateToProps = (state) => {
    return {
        inputValue: state.inputValue,
        list: state.list
    }
}
const mapDispatchToProps = (dispatch) => {
    return {
        inputChange(e) {
            dispatch(changeAction(e.target.value));
        },
        add() {
            dispatch(addAction());
        },
        del(index) {
            dispatch(delAction(index));
        }

    }

}
export default connect(mapStateToProps, mapDispatchToProps)(TodoList);

• connect第一个参数配置的是状态到props的映射，第二个参数配置的是分发action到props的映射

actionTypes.js文件

• 统一以常量定义action类型，方便调试

export const CHANGE="change";
export const ADD="add";
export const DEL="del";

actionCreator.js文件

• 抽离action创建过程

import { CHANGE, ADD, DEL } from './actionTypes'
export  const  changeAction = (value) => {
    return {
        type: CHANGE,
        value
    }

}
export const addAction = () => {
    return {
        type: ADD
    }

}
export const delAction = (index) => {
    return {
        type: DEL,
        index
    }

}

store/index.js

import { createStore } from "redux";
import reducer from "./reducer.js"
const store = createStore(reducer);
export default store;

store/reducer.js

const defaultState = {
    inputValue: "",
    list: ["学习react"," 学习vue"]
}
export default (state = defaultState, action) => {

    switch (action.type) {
        case "change": {
            const newState = JSON.parse(JSON.stringify(state));
            newState.inputValue = action.value;
            return newState;
        }
        case "add": {
            const newState = JSON.parse(JSON.stringify(state));
            newState.list.push(newState.inputValue) ;
            newState.inputValue="";
            return newState;
        }
        case "del": {
            const newState = JSON.parse(JSON.stringify(state));
            newState.list.splice(action.index,1) ;
            return newState;
        }

        default: {
            action.type = "change"
        }

    }
    return state;
}

全部代码

• 下载
• 提取码：byrq

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