在react中设置状态时设置第一个字符大写

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      text: 'hello world'
    };
  }

  handleClick = () => {
    const { text } = this.state;
    const firstChar = text.charAt(0);
    const capitalizedText = firstChar.toUpperCase() + text.slice(1);
    this.setState({ text: capitalizedText });
  }

  render() {
    const { text } = this.state;
    return (
      <div>
        <p>{text}</p>
        <button onClick={this.handleClick}>Set First Character Uppercase</button>
      </div>
    );
  }
}