react父子组件生命周期执行顺序

react生命周期执行顺序-.png

import React from 'react';
 
const buildClass = (name)=>{
  return class extends React.Component{
    constructor(props) {
      super(props);
      console.log( name + ' constructor');
    }
    UNSAFE_componentWillMount() {
      console.log( name + ' componentWillMount');
    }
    componentDidMount() {
      console.log( name + ' componentDidMount');
    }
    componentWillUnmount() {
      console.log( name + ' componentWillUnmount');
    }
    UNSAFE_componentWillReceiveProps(nextProps) {
      console.log( name + ' componentWillReceiveProps(nextProps)');
    }
    shouldComponentUpdate(nextProps, nextState) {
      console.log( name + ' shouldComponentUpdate(nextProps, nextState)');
      return true;
    }
    UNSAFE_componentWillUpdate(nextProps, nextState) {
      console.log( name + ' componentWillUpdate(nextProps, nextState)');
    }
    componentDidUpdate(prevProps, prevState) {
      console.log( name + ' componetDidUpdate(prevProps, prevState)');
    }
  }
}
class Child extends buildClass('Child'){
  render(){
    console.log('Child render')
    return (
      <div>child</div>
    )
  }
}
class ClassFn extends buildClass('Parent'){
  render(){
    console.log('Parent render')
    return (
      <Child />
    )
  }
};
 
export default ClassFn;