父组件中使用子组件的方法

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import React, { Component, Fragment } from 'react';
class Child extends Component {
    componentDidMount() {
        this.props.onRef(this);
    }
    testEvent = () => {
        console.log('我被触发了');
    }
    render() {
        return (
            '我是子组件'
        )
    }
}
export default class Parent extends Component {
    onRef = (ref) => {
        this.child = ref;
    }
    
    handleClick = () => {
        this.child.testEvent();
    }
    render() {
        return (
            <Fragment>
                <Child onRef={this.onRef} />
                <button onClick={this.handleClick}>click</button>
            </Fragment>
        )
    }
}