从React应用程序外部访问组件方法

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.myRef = React.createRef();
  }
  
  // ...
}

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.myRef = React.createRef();
  }
  
  handleClick() {
    // 处理点击事件
  }
  
  render() {
    return (
      <div>
        {/* ... */}
      </div>
    );
  }
}

class ParentComponent extends React.Component {
  handleClick() {
    this.childComponentRef.current.handleClick();
  }
  
  render() {
    return (
      <div>
        <MyComponent ref={this.childComponentRef} />
        <button onClick={this.handleClick.bind(this)}>调用子组件方法</button>
      </div>
    );
  }
}