Preface recently started a new project, want to do a good job of code specifications and constraints, in fact, there are a lot of scaffolding, project templates can be used directly, but do-it-yourself, can be completely self-matching. install eslint install and execute yarn add-- dev eslint add .eslintrc.js to the project directory module.exports = { root: true, // specify root as true,eslint to check only the current project directory env: { // provide default global variables to prevent eslint from checking for errors, such as window browser: true, node: true, es6: true, }, extends: [ // inherit the inspection rules recommended by eslint 'eslint:recommended', ], parserOptions: { ecmaVersion: 'latest', // specify the ECMAScript syntax as up-to-date sourceType: 'module', // specify the code as ECMAScript module ecmaFeatures: { jsx: true, // enable jsx }, }, }; add .eslintignore to the project directory, ignoring some directories and files that do not require eslint detection .eslintrc.js node_modules dist .DS_Store *.local install typescript-eslint since the project uses Typescript , you need to change the eslint interpreter. Refer to typescript-eslint . install and execute yarn add-- dev @ typescript-eslint/parser @ typescript-eslint/eslint-plugin change .eslintrc.js module.exports = { root: true, // specify root as true,eslint to check only the current project directory env: { // provide default global variables to prevent eslint from checking for errors, such as window browser: true, node: true, es6: true, }, extends: [ // share the recommended configuration style 'eslint:recommended', 'plugin:@typescript-eslint/recommended', ], parser: '@typescript-eslint/parser', plugins: ['@typescript-eslint'], parserOptions: { ecmaVersion: 'latest', // specify the ECMAScript syntax as up-to-date sourceType: 'module', // specify the…

simple preparation quickly build react projects through create-react-app install dependent npm install redux react-redux redux-thunk-- save (redux-thunk is middleware for handling asynchronous data streams) change, create a new project directory effect diagram Demo start write redux related content action export const Increment = 'increment' export const Decrement = 'decrement' /*Action creator action constructor*/ export const increment = (counterIndex) => { type:Increment, counterIndex } export const decrement = (counterIndex) => ({ type: Decrement, counterIndex }) Action is essentially a JavaScript normal object. A type field of string type must be used in action to represent the action to be performed, but you need to write as many action as you need to write action, so you need action creator. This action constructor returns a js object. Of course, you need to return a function when dealing with asynchronous data. In this case, middleware is needed to rewrite dispatch. reducer import { Increment, Decrement } from '../Action' export default (state,action) => { const {counterIndex} = action switch (action.type) { case Increment: return {...state, [counterIndex]:state[counterIndex]+1} case Decrement: return {...state, [counterIndex]:state[counterIndex]-1} default: return state } } the specific definition of reducer can be found in the redux README. Since demotion is too simple, let's split and merge reducer. Here we mainly introduce the workflow of redux in react. Note here that reducer is a pure function and cannot change state. The new state returned here can use Object.assign and the object extender of es6. store import {applyMiddleware, createStore} from 'redux' import thunk from 'redux-thunk' import reducer from '../Reducer' const initValue={ 'First':1, 'Second':5, 'Third':6 }…