MEAN - 以角度服务

Question

拜托，我遇到过路线障碍的问题。更好的是，我需要一种方法从我的后端在我的角度服务中获取路由参数...我正在研究MEAN应用程序......

这个想法是，每篇文章都附有一系列评论，我已经在邮局的后端测试了这个，我得到了理想的结果......

我遇到的问题是，每当我导航到文章的评论路线时，articleId都会返回undefined

下面是我的代码

my articles service that returns article and comments

    getComments() {
        const articleId = this.activatedRoute.snapshot.params['articleId'];
        return this.http.get('http://localhost:7777/article/' + articleId + '/comments')
            .map((response: Response) => {
                const comments = response.json().obj;
                const transformedComments: Comment[] = [];
                for (const comment of comments) {
                    transformedComments.push(new Comment(
                        comment.body,
                        comment.username,
                        comment._id,
                        comment.articleId
                    ));
                }
                this.comments = transformedComments;
                console.log(transformedComments);
                console.log(articleId);
                return transformedComments;
            })
            .catch((error: Response) => Observable.throw(error.json()));
    }

    getComment() {
        const headers = new Headers({ 'Content-Type': 'application/json' });
        const token = localStorage.getItem('token')
            ? '?token=' + localStorage.getItem('token')
            : '';
        const articleId = this.activatedRoute.snapshot.params['articleId'];
        // const commentId = this.activatedRoute.snapshot.params['commentId'];
        return this.http.get('http://localhost:7777/article/' + articleId + '/comments/' + token, { headers: headers })
            .map((response: Response) => {
                const comment = response.json().comment;
                const singleComment = new Comment(
                    comment.body,
                    comment.username,
                    comment._id,
                    comment.articleId
                );
                this.comment = singleComment;
                return singleComment;
            })
            .catch((error: Response) => Observable.throw(error.json()));
    }

  

我怀疑是我在角色服务中使用activatedRoute.snapshot.params的地方   加上我不确定，让我说我不知道​​怎么或为什么这篇文章没有得到路线的快照

我的评论组件

import { Component, OnInit, ViewEncapsulation, Input } from '@angular/core';

import { ArticleService } from '../../article.service';
import { User } from '../../../auth/user.model';
import { Comment } from '../../comment.model';
import { ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-article-comment-list',
  templateUrl: './article-comment-list.component.html',
  styleUrls: ['./article-comment-list.component.css'],
  // providers: [ArticleService],
  encapsulation: ViewEncapsulation.None
})
export class ArticleCommentListComponent implements OnInit {
  private User: any;
  article: any;

  constructor(private articleService: ArticleService, private activatedRoute: ActivatedRoute ) { }

  comments: Comment[];
  ngOnInit() {

    this.articleService.getComments()
      .subscribe(
        (comments: Comment[]) => {
          this.comments = comments;
        });
  }

}