hm-react-cli/template/app/src/components/Parent.js

Create a Huimei React project by module

import { useEffect, Component } from 'react';
import Child from './Child';

export default class Parent extends Component {
    state = {
        count: 1
    };

    componentDidMount() {
    }

    inc() {
        this.setState({ count: this.state.count + 1 });
    }

    render() {
        const count = this.state.count;
        return (
            <div id="Parent">
                count
                <Child count={count} />
                <button onClick={() => this.inc()}>inc</button>
            </div>
        );
    }
}