如何在react中从className检索文本

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

  render() {
    return (
      <div ref={this.myRef} className="myClassName">
        检索文本的示例
      </div>
    );
  }
}

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

  componentDidMount() {
    const elements = document.getElementsByClassName("myClassName");
    const text = elements[0].textContent;
    console.log(text);
  }

  render() {
    return (
      <div ref={this.myRef} className="myClassName">
        检索文本的示例
      </div>
    );
  }
}