如何实现定时任务有懂的吗？

let timeout = 1000*60*30;
  timeout = 1000*60*2;
  let that = this;
  if (this.timeoutID == 0) {
    this.startTime();
    let timeoutID = setInterval(function (){
      console.info('timeoutID')
      that.btnTimeText = '定时器已启动';
      that.timeoutID = timeoutID;
      that.timeoutCount = that.timeoutCount + 1;
      console.info('timeoutCount=' + that.timeoutCount )
      that.btnTimeText = '定时器已启动 ' + that.timeoutCount;
    },timeout);
  } else {
    that.btnTimeText = '启动定时器';
    clearTimeout(that.timeoutID);
    that.timeoutID = 0
  }
})
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