Observable - 使用Observable

  Observable.of(1, 2, 3).subscribe(
    doSomething,
    reject,
    resolve);
});
The forEach pattern is useful for a sequence of events you only expect to happen once.
export class MyApp {
  private data: Observable<Array<number>>;
  private values: Array<number> = [];
  private anyErrors: boolean;
  constructor() {
  }
  init() {
      this.data = new Observable(observer => {
          setTimeout(() => {
              observer.next(42);
          }, 1000);
          setTimeout(() => {
              observer.next(43);
          setTimeout(() => {
              observer.complete();
          }, 3000);
          this.status = "Started";
      });
      let subscription = this.data.forEach(v => this.values.push(v))
            .then(() => this.status = "Ended");
  }