一、render props
1 import React, { Component } from 'react' 2 import './index.css' 3 import C from '../1_setState' 4 5 export default class Parent extends Component { 6 render() { 7 return ( 8 <div className="parent"> 9 <h3>我是Parent組件</h3> 10 <A render={(name)=><C name={name}/>}/> 11 </div> 12 ) 13 } 14 } 15 16 class A extends Component { 17 state = {name:'tom'} 18 render() { 19 console.log(this.props); 20 const {name} = this.state 21 return ( 22 <div className="a"> 23 <h3>我是A組件</h3> 24 {this.props.render(name)} 25 </div> 26 ) 27 } 28 } 29 30 class B extends Component { 31 render() { 32 console.log('B--render'); 33 return ( 34 <div className="b"> 35 <h3>我是B組件,{this.props.name}</h3> 36 </div> 37 ) 38 } 39 }
二、ErrorBoundary錯誤邊界
1 import React, { Component } from 'react' 2 3 export default class Child extends Component { 4 state = { 5 users:[ 6 {id:'001',name:'tom',age:18}, 7 {id:'002',name:'jack',age:19}, 8 {id:'003',name:'peiqi',age:20}, 9 ] 10 // users:'abc' 11 } 12 13 render() { 14 return ( 15 <div> 16 <h2>我是Child組件</h2> 17 { 18 this.state.users.map((userObj)=>{ 19 return <h4 key={userObj.id}>{userObj.name}----{userObj.age}</h4> 20 }) 21 } 22 </div> 23 ) 24 } 25 }
(2)parent.jsx
1 import React, { Component } from 'react' 2 import Child from './Child' 3 4 export default class Parent extends Component { 5 6 state = { 7 hasError:'' //用於標識子組件是否產生錯誤 8 } 9 10 //當Parent的子組件出現報錯時候,會觸發getDerivedStateFromError調用,並攜帶錯誤信息 11 static getDerivedStateFromError(error){ 12 console.log('@@@',error); 13 return {hasError:error} 14 } 15 16 componentDidCatch(){ 17 console.log('此處統計錯誤,反饋給服務器,用於通知編碼人員進行bug的解決'); 18 } 19 20 render() { 21 return ( 22 <div> 23 <h2>我是Parent組件</h2> 24 {this.state.hasError ? <h2>當前網絡不穩定,稍後再試</h2> : <Child/>} 25 </div> 26 ) 27 } 28 }