原生实现一个react-redux的代码示例

自己动手实现一个react-redux

之前试过自己动手实现一个redux，这篇blog主要记录动手实现一个react-redux的过程。

这个react-redux还有一点点小瑕疵，我以一个计数器作为例子来实现的。

这是目录结构:

这里的connect.js文件就是react-redux。

rush:plain;"> ├─component │ connect.js │ counter.js │ └─store index.js

index.js：

rush: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(,document.getElementById("root"));

./store/index.js:

rush: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:

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:

rush:js;"> import React from "react"; import {connect} from "./connect"; export default class Counter extends React.Component{ constructor(props){ super(props); }

render(){
return (

{ this.props.add(5); }}>+ {this.props.n}

) } }

let mapStatetoProps=(state)=>{
return {n:state.number}
};
let mapdispatchToProps=(dispatch)=>{
return {
add:(count)=>{
dispatch({type:"add",count:count})
}
}
}

export default connect(mapStatetoProps,mapdispatchToProps)(Counter)

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程之家。