如何在setState中停止递减为负

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 10
    };
  }

  decrementCount = () => {
    if (this.state.count > 0) {
      this.setState(prevState => ({
        count: prevState.count - 1
      }));
    }
  }

  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
        <button onClick={this.decrementCount}>Decrement</button>
      </div>
    );
  }
}