源代碼：

import { of, fromEvent, interval, Observable } from 'rxjs'; import { Injectable } from '@angular/core'; import { map, switchMap } from 'rxjs/operators'; import { tap } from 'rxjs/operators'; import { OperatorFunction } from 'rxjs';@Injectable() export class JerrySandBoxService{name = 'Jerry';jerryMap: OperatorFunction<Event, number> = switchMap(this.jerryintervalFunction);jerryintervalFunction(event: Event){console.log('event: ' + event.timeStamp );/*returns an Observable that emits an infinite sequence of ascending integers, with a constant interval of time of your choosing between those emissions.*///const a = interval(1000);//return a;// return event.timeStamp;return of(event.timeStamp);}print(){/*const observable = of(1, 2, 3);const newObservable = observable.pipe(tap(num => console.log(num)),map(num => 'hello world: ' + num));newObservable.subscribe(data => console.log('in subscribe: ' + data));*/const clicks: Observable<Event> = fromEvent(document, 'click');const result = clicks.pipe(this.jerryMap);//result.subscribe(x => console.log(x));result.subscribe(x => {console.log(x);});} }

每點擊瀏覽器顯示的窗口一次，就能顯示點擊事件發生時的時間戳：

總結

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