RxJS之组合操作符 ( Angular环境 )

import { Component, OnInit } from ‘@angular/core‘;import { of } from ‘rxjs/observable/of‘;import { range } from ‘rxjs/observable/range‘;import { merge } from ‘rxjs/observable/merge‘;import { Observable } from ‘rxjs/Observable‘;@Component({ ?selector: ‘app-combine‘, ?templateUrl: ‘./combine.component.html‘, ?styleUrls: [‘./combine.component.css‘]})export class CombineComponent implements OnInit { ?constructor() { } ?ngOnInit() { ???const low: Observable<number> = range(100, 3); ???const middle: Observable<number> = range(200, 3); ???const high: Observable<number> = range(300, 3); ???merge(low, middle, high).subscribe((val: number) => { ?????console.log(val); ???}); ?}}