import { timer } from 'rxjs';

定義時間變量

timeSubscriber = null;  

觸發(fā) 每隔一秒

startUpdateTime(ms = 1000) {
   this.timeSubscriber = timer(0, ms).subscribe(() => {
  //操作
   });
 }

銷毀timeSubscriber

  stopUpdateTime() {
    if (this.timeSubscriber) {
      this.timeSubscriber.unsubscribe();
      this.timeSubscriber = null;
    }
  }