Javascript 按角度将阵列从一个组件传递到另一个组件

在我的Angular应用程序中，我试图将数组

播放列表

从一个组件（1）传递到另一个组件（2）。最好的方法是什么@输入

组件1.ts

import { Component, OnInit } from '@angular/core';
import { ApiService } from '../../../services/api.service';
import { FormGroup, FormControl } from '@angular/forms';
import { FormBuilder } from '@angular/forms';
import { faSearch } from '@fortawesome/free-solid-svg-icons';
import { faRedo } from '@fortawesome/free-solid-svg-icons';
import { faHeadphones } from '@fortawesome/free-solid-svg-icons';
import { faExternalLinkAlt } from '@fortawesome/free-solid-svg-icons';
import { faPlus } from '@fortawesome/free-solid-svg-icons';


@Component({
  selector: 'app-content',
  templateUrl: './content.component.html',
  styleUrls: ['./content.component.scss']
})
export class ContentComponent {

  public data = [];
  public playlist = [];
  public apiData: any;
  public results = [];
  public loading = false;
  public noData: any;
  p: number = 1;
  faSearch = faSearch;
  faRedo = faRedo;
  faHeadphones = faHeadphones;
  faExternalLinkAlt = faExternalLinkAlt;
  faPlus = faPlus;

  searchQuery: string = "";
  clickMessage = '';

  constructor(private service: ApiService) { }

  getAll() {
    this.service.getAll(this.searchQuery).subscribe((results) => {
      this.loading = true;
      console.log('Data is received - Result - ', results);
      this.data = results.results;
      this.loading = false;

      if (this.data.length <= 0) {
        this.noData = true;
      } else if (this.data.length >= 1) {
        this.noData = false;
      } else {
        this.noData = false;
      }
    })
  }

  closeAlert() {
    this.noData = false;
  }

  addSongToPlaylist(itunes) {
    this.playlist.push(itunes);
    console.log('Playlist - ', this.playlist);
}

  refresh(): void {
    window.location.reload();
  }

  Search() {
    this.service.getAll(this.searchQuery).subscribe((results) => {
      this.loading = true;
      console.log('Data is received - Result - ', results);
      this.data = results.results;
      this.loading = false;
    })
  }
  ngOnInit() {

  }
}

import { Component, OnInit, Input } from '@angular/core';
import { faHeadphones} from '@fortawesome/free-solid-svg-icons';

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

  faHeadphones = faHeadphones;

  @Input()playlist = [];

  constructor() { }

  ngOnInit() {
  }

}

---

您可以使用@Input传递数组，但子组件将获得播放列表的引用。 如果要传递播放列表副本，请按此方法执行
在内容组件中

playlistToPass = JSON.stringify(this.playlist);

然后转换回HeaderComponent中的数组

playlist = JSON.parse(this.playlistPassed);

---

我发现最简单、最有效的方法是通过服务。然后将其传递到组件的

构造函数中

import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class PlaylistService {

  public playlist = [];

  constructor() { 

  }
}

组件通信有很多方法，主要方法是输入（将数据传递给子级）、输出（将数据传递给父级）或共享服务（在任意组件之间传递数据）。您如何使用输入方法传递数组，正如我看到的，这主要是使用字符串数组中的其他对象播放列表是对象数组。使用JSON.stringify（）将对象数组转换为JSON字符串没有问题。