如何创建暂停/恢复计时器，也计算中断时间，使用RxJS

import { interval, timer, Subject } from 'rxjs';
import { takeUntil, scan, startWith } from 'rxjs/operators';

const pauseResume$ = new Subject();

const timer$ = interval(1000).pipe(
  startWith(0),
  scan((acc) => acc + 1)
);

const pausedTimer$ = timer$.pipe(
  takeUntil(pauseResume$)
);

let startTime;
let totalInterruptTime = 0;

pausedTimer$.subscribe({
  next: (value) => {
    console.log('计时器值:', value);
  },
  complete: () => {
    console.log('计时器完成');
  }
});

// 暂停计时器
function pauseTimer() {
  pauseResume$.next();
  startTime = Date.now();
}

// 恢复计时器
function resumeTimer() {
  const interruptTime = Date.now() - startTime;
  totalInterruptTime += interruptTime;
  pauseResume$.next();
}