vue 倒计时 分秒

开始倒计时
begin() {
      this.countDown = '15分00秒';
      this.maxTime = 15 * 60;
      this.handleCountDown();
    },
handleCountDown() {
      this.interval = setInterval(() => {
        this.maxTime--;
        let minutes = Math.floor(this.maxTime / 60);
        let seconds = Math.floor(this.maxTime % 60);
        minutes = minutes < 10 ? '0' + minutes : minutes;
        seconds = seconds < 10 ? '0' + seconds : seconds;
        this.countDown = minutes + "分" + seconds + "秒";
        if (this.maxTime === 0) {
          clearInterval(this.interval)
        }
      }, 1000)
    },