在TypeScript中将内部对象属性更改为数组

Question

出现了这样的问题，我已经苦了几天，我还是一个新手。

使用对Wikipedia API的GET请求，我得到了这个对象

事实证明，对于页面对象，属性的名称（也是对象）始终等于pageid（在本例中为“ 9475”）。 如果我事先不知道该对象的名称，该如何访问该对象？

然后，必须将该对象转换为数组，以便可以使用ngFor。

我在search.component.ts中使用showArticleInformation方法获得的对象

search.component.ts

import { Component, OnInit } from '@angular/core';
import { Article, ArticleInformation, ArticlesService } from '../../services/articles.service';

@Component({
  selector: 'app-search',
  templateUrl: './search.component.html',
  styleUrls: ['./search.component.css'],
  providers: [ArticlesService]
})

export class SearchComponent implements OnInit {
  constructor(private articlesServices: ArticlesService) { }

  searchQuery: string;

  articles: { };
  articleInformation: ArticleInformation;

  getUrl(searchQuery: string) {
    return 'https://ru.wikipedia.org/w/api.php?action=opensearch&profile=strict&search='
      + searchQuery + '&limit=100&namespace=0&format=json&origin=*';
  }

  getUrlInformation(searchQuery: string) {
    return 'https://ru.wikipedia.org/w/api.php?action=query&titles='
      + searchQuery + '&prop=info&format=json&origin=*';
  }

  showArticles() {
    this.articlesServices.getArticles(this.getUrl(this.searchQuery))
      .subscribe(
        (data: Article) => this.articles = Object.values({ ...data })
      );
  }

  showArticleInformation() {
    this.articlesServices.getArticleInformation(this.getUrlInformation(this.searchQuery))
      .subscribe(
        (data: ArticleInformation) => this.articleInformation = { ...data }
      );
    console.log(this.articleInformation);
  }

  ngOnInit() {
  }
}

article.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { retry } from 'rxjs/operators';

export interface Article {
  title: string;
  collection: string[];
  description: string[];
  links: string[];
}

export interface ArticleInformation {
  batchComplete: string;
  query: {
    pages: { }
  };
}

@Injectable({
  providedIn: 'root'
})

export class ArticlesService {
  constructor(private http: HttpClient) { }

  getArticles(url) {
    return this.http.get<Article>(url)
      .pipe(
        retry(3),
      );
  }

  getArticleInformation(url) {
    return this.http.get<ArticleInformation>(url)
      .pipe(
        retry(3),
      );
  }
}

Answer 1

如果确定pages将始终具有一个属性并且只需要它的value ，则可以使用Object.values进行Object.values ：

 const data = { batchComplete: "", query: { pages: { "9745": { pageid: 9745, length: 48, lastrevid: 100, contentmodel: "wikitext", touched: "2019-02-01" } } } } const articleInformation = { ...data, query: { pages: [Object.values(data.query.pages)[0]] } } console.log(articleInformation) 

但是，您需要为此this.articleInformation和data使用单独的interface ，因为它们具有不同的结构。

像这样：

export interface ArticleInformationNew {
  batchComplete: string;
  query: {
    pages: any[]
  };
}