React扩展之renderProps&ErrorBoundar

renderProps

import React, { Component } from 'react'
import './index.css'

export default class Parent extends Component {
    render() {
        return (
            <div className="parent">
                <h3>我是Parent组件</h3>
                <A render={(name)=><C name={name}/>}/>
            </div>
        )
    }
}

class A extends Component {
    state = {name:'tom'}
    render() {
        console.log(this.props);
        const {name} = this.state
        return (
            <div className="a">
                <h3>我是A组件</h3>
                {this.props.render(name)}
            </div>
        )
    }
}

class B extends Component {
    render() {
        console.log('B--render');
        return (
            <div className="b">
                <h3>我是B组件,{this.props.name}</h3>
            </div>
        )
    }
}

ErrorBoundary

分别创建父子组件 Child.jsx 和 Parent.jsx

import React, { Component } from 'react'

export default class Child extends Component {
    state = {
        users:[
            {id:'001',name:'tom',age:18},
            {id:'002',name:'jack',age:19},
            {id:'003',name:'peiqi',age:20},
        ]
        // users:'abc'
    }

    render() {
        return (
            <div>
                <h2>我是Child组件</h2>
                {
                    this.state.users.map((userObj)=>{
                        return <h4 key={userObj.id}>{userObj.name}----{userObj.age}</h4>
                    })
                }
            </div>
        )
    }
}

使用

import React, { Component } from 'react'
import Child from './Child'

export default class Parent extends Component {

    state = {
        hasError:'' //用于标识子组件是否产生错误
    }

    //当Parent的子组件出现报错时候，会触发getDerivedStateFromError调用，并携带错误信息
    static getDerivedStateFromError(error){
        console.log('@@@',error);
        return {hasError:error}
    }

    componentDidCatch(){
        console.log('此处统计错误，反馈给服务器，用于通知编码人员进行bug的解决');
    }

    render() {
        return (
            <div>
                <h2>我是Parent组件</h2>
                {this.state.hasError ? <h2>当前网络不稳定，稍后再试</h2> : <Child/>}
            </div>
        )
    }
}