一 merge操作符

把多個 Observables 的值混合到一個 Observable 中

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);
    });
  }

}

RxJS之組合操作符 ( Angular環境 )