如何在reactjs中访问另一个组件的函数？

// 父组件
import React from 'react';
import ChildComponent from './ChildComponent';

class ParentComponent extends React.Component {
  handleClick() {
    console.log('Parent component function called');
  }

  render() {
    return (
      <div>
        <ChildComponent handleClick={this.handleClick} />
      </div>
    );
  }
}

// 子组件
import React from 'react';

class ChildComponent extends React.Component {
  render() {
    return (
      <div>
        <button onClick={this.props.handleClick}>Call Parent Function</button>
      </div>
    );
  }
}

// 父组件
import React from 'react';
import ChildComponent from './ChildComponent';

class ParentComponent extends React.Component {
  handleClick() {
    console.log('Child component function called');
  }

  render() {
    return (
      <div>
        <ChildComponent ref={(child) => { this.childComponent = child; }} />
        <button onClick={() => { this.childComponent.handleClick(); }}>Call Child Function</button>
      </div>
    );
  }
}

// 子组件
import React from 'react';

class ChildComponent extends React.Component {
  handleClick() {
    console.log('Child component function called');
  }

  render() {
    return (
      <div>
        Child Component
      </div>
    );
  }
}

// 创建一个上下文对象
const MyContext = React.createContext();

// 父组件
import React from 'react';
import ChildComponent from './ChildComponent';

class ParentComponent extends React.Component {
  handleClick() {
    console.log('Shared function called');
  }

  render() {
    return (
      <MyContext.Provider value={this.handleClick}>
        <ChildComponent />
      </MyContext.Provider>
    );
  }
}

// 子组件
import React from 'react';
import MyContext from './MyContext';

class ChildComponent extends React.Component {
  render() {
    return (
      <div>
        <MyContext.Consumer>
          {(handleClick) => (
            <button onClick={handleClick}>Call Shared Function</button>
          )}
        </MyContext.Consumer>
      </div>
    );
  }
}