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This time I will bring you what are the precautions for using raw operation react-redux. The following is a practical case, let's take a look.
Implement a react-redux by myself
I have tried to implement a redux by myself before. This blog mainly records the process of implementing a react-redux by myself.
This react-redux still has a few minor flaws. I implemented it using a counter as an example.
This is the directory structure:
The connect.js file here is react-redux.
├─component │ connect.js │ counter.js │ └─store index.js
index.js:
import React from "react"; import ReactDom,{render} from "react-dom"; import Couter from "./component/counter"; import {Provider} from "./component/connect" import store from "./store/index" ReactDom.render(<Provider store={store}><Couter/></Provider>,document.getElementById("root"));
./store/index.js:
import {createStore} from "redux"; function reducer(state={number:0},action) { switch (action.type){ case "add": return {number:state.number+action.count} default: return state; } } export default createStore(reducer);
./component/connect.js:
import React from "react"; import PropTypes from "prop-types"; //Provider是一个组件 接受一个store属性 将其内容挂载在上下文context //这样后代才可以都有办法拿到 class Provider extends React.Component{ static childContextTypes={ //设置上下文的类型是对象 store:PropTypes.object } getChildContext(){ //获取并设置后代上下文的内容 return {store:this.props.store} } render(){ return this.props.children } } let connect=(mapStateToProps,mapDispatchToProps)=>(comp)=>{ return class Proxy extends React.Component{ static contextTypes={ store:PropTypes.object } constructor(props,context){ super(props); //将参数mapStateToProps 的解构赋值 代理组件的状态 this.setState=mapStateToProps(context.store.getState()) } componentDidMount(){ this.context.store.subscribe(()=>{ this.setState(mapStateToProps(this.context.store.getState())) }) } render(){ return <comp {...this.state} {...mapDispatchToProps(this.context.store.dispatch)}/> } } } export {Provider,connect}
./ component/counter.js:
import React from "react"; import {connect} from "./connect"; export default class Counter extends React.Component{ constructor(props){ super(props); } render(){ return ( <p> <button onClick={()=>{ this.props.add(5); }}>+</button> {this.props.n} </p> ) } } let mapStateToProps=(state)=>{ return {n:state.number} }; let mapDispatchToProps=(dispatch)=>{ return { add:(count)=>{ dispatch({type:"add",count:count}) } } } export default connect(mapStateToProps,mapDispatchToProps)(Counter)
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!
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