【angular服务注入的时候这里为什么没获取到数据？ _angular基础】

angular服务注入的时候这里为什么没获取到数据？

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angular基础

详细描述

截图

代码

import { Component, OnInit } from '@angular/core';
import { Hero } from '../hero';
import { HeroService } from '../hero.service';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.scss']
})
export class HeroesComponent implements OnInit {

  constructor(private heroService: HeroService) {

  }
  heroes: Hero[];
  selectHero: Hero;
  getHeroes(): void {
    this.heroService.getHeroes().subscribe(heroes => heroes = heroes);
  }
  onSelect(hero: Hero) {
    this.selectHero = hero;
  }
  ngOnInit() {
    this.getHeroes();
  }

}

import { Injectable } from '@angular/core';
import { Hero } from "./hero";
import { HEROES } from "./mock-heroes";
import { MessageService } from "./message.service";
import { Observable, of } from "rxjs";
@Injectable({
  providedIn: 'root'
})
export class HeroService {

  constructor(private messageService: MessageService) { }
  getHeroes(): Observable<Hero[]> {
    this.messageService.add('HeroService: fetched heroes');
    return of(HEROES);
  }

}

编辑于2024-11-11