Reference: Jane Book: Aermin

class MyComponent extends React.Component{
        // constructor
        constructor(props){
                console.log('constructor');
                super(props);
                this.state = {
                        name:'zhangsan'}}// The component will be mounted
        componentWillMount(){
                console.log('componentWillMount');
        }

        // The component is mounted
        componentDidMount(){
                console.log('componentDidMount');
        }

        // Returns false by default. Returns true to update component page content
        shouldComponentUpdate(){
                console.log('shouldComponentUpdate');
                return true;
        }

        // The component will be updated
        componentWillUpdate(){
                console.log('componentWillUpdate');
        }

        // The component is updated
        componentDidUpdate(){
                console.log('componentDidUpdate');
        }

        // The component will be unmounted
        componentWillUnmount(){
                console.log('componentWillUnmount');
        }
        
        // Custom functions
        changeName = () = > {
                this.setState({
                        name:'lisi'})}// Custom functions
        unmountComponent = () = > {
                // Manually unmount components
                ReactDOM.unmountComponentAtNode(document.getElementById('root'));
        }

        // Component rendering
        render(){
                console.log('render');
                return (
                        <div>
                                <button onClick={this.changeName}>Click to change the name: {this.state.name}</button>
                                <br/>
                                <br/>
                                <button onClick={this.unmountComponent}>Uninstall the component</button>
                        </div>
                )
        }
}

ReactDOM.render(<MyComponent age = {26} />.document.getElementById('root'));
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There is also a life cycle function, as a novice, not very understand

componentWillReceiveProps(){
        console.log('componentWillReceiveProps');
}
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But the official documentation seems to suggest an alternative

getDerivedStateFromProps(){}
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Life cycle functions are displayed in sequence before updating status is clicked

Click update status to display life cycle sequence

Life cycles are displayed in sequence after manually uninstalling components