当你将道具传递给子组件时，如何在onChange中设置状态？

class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      value: ''
    };
  }

  handleChange = (newValue) => {
    this.setState({ value: newValue });
  }

  render() {
    return (
      <ChildComponent value={this.state.value} onChange={this.handleChange} />
    );
  }
}

class ChildComponent extends React.Component {
  handleInputChange = (event) => {
    const newValue = event.target.value;
    this.props.onChange(newValue);
  }

  render() {
    return (
      <input type="text" value={this.props.value} onChange={this.handleInputChange} />
    );
  }
}