Previous, we do composition with objects: const todoApp = (state = {}, action) => { return { todos: todos( state.todos, action ), visibilityFilter: visibilityFilter( state.visibilityFilter, action ) }; }; Since it is common options in Redux,  there i…

The combineReducers function we used in previous post: const todoApp = combineReducers({ todos, visibilityFilter }); It accepts and object as agruement; It returns an function Implemente by ourself: // reducers: {todos: todos, filter: filter} const c…

Redux源码分析之基本概念 Redux源码分析之createStore Redux源码分析之bindActionCreators Redux源码分析之combineReducers Redux源码分析之compose combineReducers:把recuder函数们,合并成一个新的reducer函数,dispatch的时候,挨个执行每个reducer 我们依旧先看一下combineReduers的使用效果 let { createStore, bindActionCreators, co…

combineReducers combineReducer 是将众多的 reducer 合成通过键值映射的对象,并且返回一个 combination 函数传入到 createStore 中 合并后的 combination 能够调用个子 reducer,并且对 state 状态进行更新 源码: import { ActionTypes } from "./createStore"; import isPlainObject from "lodash/isPlainObjec…

const reactInit = '@@react/Init' const combineReducers = (reducers) => { const finalReducers = {} for (let key in reducers) { const reducer = reducers[key] if (typeof reducer === 'undefined') { console.error(`reducer${key}的值是undefined`) } if (typeof…

上一篇有了解到,reducer函数的两个为:当前state和此次dispatch的action. state的结构是JavaScript对象,每个key都可以代表着不同意义的数据.比如说 { lists:object, type:string } lists管理列表数据,type管理选中的类型.此时就需要考虑将state分为不同的子树,每次子树数据对应一个reducer子函数,单独管理对应的state.但是createStore(reducer,preloadedState)函数接收的reduc…

数据都放在reducer.js下不利于对数据进行管理,可以把一个大的reducer.js拆分成多个小的reducer.js. 小的reducer.js const defaultState={ focused:false } export default(state=defaultState,action)=>{ if(action.type=='input_focus'){ return {focused:true} } if(action.type=='input_blur'){ retur…

1 使用combineReaducers 整合reducers import { combineReducers } from 'redux-immutable'; import { reducer as headerReducer } from '../common/header/store'; import { reducer as homeReducer } from '../pages/home/store'; import { reducer as detailReducer } fr…

一.从‘redux’包中引入combineReducers方法: import { combineReducers } from 'redux'; 二.针对state的不同属性写不同的reducer,每一个reducer专门负责修改state的某一个属性. 写出来所有的reducer函数,这些函数的第一个参数是对应的state属性,第二个参数是action.函数最后返回的结果也是state的属性,而不是整个state. //state structure // const state = { /…

combineReducers(reducers) 随着应用变得复杂,需要对 reducer 函数 进行拆分,拆分后的每一块独立负责管理 state 的一部分. combineReducers 辅助函数的作用是,把一个由多个不同 reducer 函数作为 value 的 object,合并成一个最终的 reducer 函数,然后就可以对这个 reducer 调用 createStore. 合并后的 reducer 可以调用各个子 reducer,并把它们的结果合并成一个 state 对象.sta…