检查在React中悬停的元素

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isHovered: false,
    };
  }

  // ...
}

class MyComponent extends React.Component {
  // ...

  handleMouseEnter = () => {
    this.setState({
      isHovered: true,
    });
  }

  handleMouseLeave = () => {
    this.setState({
      isHovered: false,
    });
  }

  // ...
}

class MyComponent extends React.Component {
  // ...

  render() {
    return (
      <div
        onMouseEnter={this.handleMouseEnter}
        onMouseLeave={this.handleMouseLeave}
      >
        {/* 元素内容 */}
      </div>
    );
  }

  // ...
}

class MyComponent extends React.Component {
  // ...

  render() {
    const { isHovered } = this.state;

    return (
      <div
        onMouseEnter={this.handleMouseEnter}
        onMouseLeave={this.handleMouseLeave}
      >
        {isHovered ? "元素悬停状态" : "元素非悬停状态"}
      </div>
    );
  }

  // ...
}