react-选择背景色问题

constructor(props) {
  super(props);
  this.state = {
    backgroundColor: 'white'
  };
}

render() {
  return (
    <div style={{ backgroundColor: this.state.backgroundColor }}>
      {/* 组件内容 */}
    </div>
  );
}

handleButtonClick = () => {
  this.setState({ backgroundColor: 'blue' });
}

render() {
  return (
    <div>
      <button onClick={this.handleButtonClick}>改变背景色</button>
      <div style={{ backgroundColor: this.state.backgroundColor }}>
        {/* 组件内容 */}
      </div>
    </div>
  );
}