Rxjs之创建操作符（Angular环境）

import { Component, OnInit } from ‘@angular/core‘;
import { of } from ‘rxjs/observable/of‘;
import { Observable } from ‘rxjs/Observable‘;

@Component({
  selector: ‘app-create‘,
  templateUrl: ‘./create.component.html‘,
  styleUrls: [‘./create.component.css‘]
})
export class CreateComponent implements OnInit {

  constructor() { }

  ngOnInit() {

    // 从数组创建

    const arr = [‘red‘, ‘yellow‘, ‘blue‘];
    const colors: Observable<string[]> = of(arr);
    colors.subscribe((colorsArr: string[]) => {
      console.log(colorsArr);
    });

    // 从迭代器对象创建

    const map: Map<string, any> = new Map();
    map.set(‘fruit‘, ‘orange‘);
    of(map).subscribe(
      (fruitsMap: Map<string, any>) => {
        console.log(fruitsMap);
      }
    );
  }

}

import { Component, OnInit } from ‘@angular/core‘;
import { from } from ‘rxjs/observable/from‘;
import { Observable } from ‘rxjs/Observable‘;

@Component({
  selector: ‘app-create‘,
  templateUrl: ‘./create.component.html‘,
  styleUrls: [‘./create.component.css‘]
})
export class CreateComponent implements OnInit {

  constructor() { }

  ngOnInit() {

    // 从数组创建

    const arr = [‘red‘, ‘yellow‘, ‘blue‘];
    const colors: Observable<string> = from(arr);
    colors.subscribe((color: string) => {
      console.log(color);
    });

  }

}

import { Component, OnInit } from ‘@angular/core‘;
import { interval } from ‘rxjs/observable/interval‘;
import { Observable } from ‘rxjs/Observable‘;

@Component({
  selector: ‘app-create‘,
  templateUrl: ‘./create.component.html‘,
  styleUrls: [‘./create.component.css‘]
})
export class CreateComponent implements OnInit {

  constructor() { }

  ngOnInit() {

    interval(1000).subscribe((val: number) => {
      console.log(val);
    });

  }

}