属性不更新子组件

// 父组件
class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      data: { name: 'John' }
    };
  }

  handleClick = () => {
    this.setState(prevState => ({
      data: { ...prevState.data, name: 'Jane' }
    }));
  }

  render() {
    return (
      <div>
        <ChildComponent data={this.state.data} />
        <button onClick={this.handleClick}>Change Name</button>
      </div>
    );
  }
}

// 子组件
class ChildComponent extends React.Component {
  render() {
    return <div>{this.props.data.name}</div>;
  }
}

// 父组件
class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: 'John'
    };
  }

  handleClick = () => {
    this.setState({ name: 'Jane' });
  }

  render() {
    return (
      <div>
        <ChildComponent key={this.state.name} name={this.state.name} />
        <button onClick={this.handleClick}>Change Name</button>
      </div>
    );
  }
}

// 子组件
class ChildComponent extends React.Component {
  render() {
    return <div>{this.props.name}</div>;
  }
}