如何在react中暂停setInterval倒计时计时器？

import React, { Component } from 'react';

class Timer extends Component {
  constructor(props) {
    super(props);
    this.state = {
      isPaused: false
    };
    this.timer = null;
  }

  componentDidMount() {
    this.startTimer();
  }

  componentWillUnmount() {
    clearInterval(this.timer);
  }

  startTimer = () => {
    this.timer = setInterval(() => {
      if (!this.state.isPaused) {
        // 计时器逻辑
        // ...
      }
    }, 1000);
  }

  handlePause = () => {
    this.setState({ isPaused: true });
  }

  render() {
    return (
      <div>
        <button onClick={this.handlePause}>暂停</button>
      </div>
    );
  }
}

export default Timer;