试图区分“[对象对象]”的Angular4错误

Question

我试图在dom中显示一些信息，但是我得到了以下错误：

错误:试图区分“对象”的错误

我想要做的是迭代来自https://www.surbtc.com/api/v2/markets/btc-clp/ticker的这些数据

{“last_price”：{“1771455.0”、“中电”、"min_ask":"1771432.0“、”中电“、"max_bid":"1660003.0”、“中电”、“卷”：“178.37375119”、"BTC“、"price_variation_24h":"-0.107”、"price_variation_7d":"-0.115"}}

我想在html中这样显示它：

<div *ngFor="let price of prices">
    {{price.min_ask}}
    </div>

这是service.ts：

import { Injectable } from '@angular/core';
import { Http, Headers, Response } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import {Observable} from "rxjs";
import 'rxjs/Rx';
import 'rxjs/add/operator/catch';
import { SurbtcMarket } from './surbtcmarket'


@Injectable()
export class SurbtcService {

  constructor(private http: Http, private surBtcMarket : SurbtcMarket) { }

  public getPricess() :Observable<SurbtcMarket> {
    return this.http.get('https://www.surbtc.com/api/v2/markets/btc-clp/ticker')
    .map((response: Response) => response.json());
  }

}

接口surbtcmarket.ts

export class SurbtcMarket {
public ticker: SurbtcMarketView[];
}

export class SurbtcMarketView {
  public last_price : number;
  public min_ask : number;
  public max_bid : number;
  public volume : number;
  public price_variation_24h : number;
  public price_variation_7d : number;
}

component.ts

import { Http, Response, Headers } from '@angular/http';
import { SurbtcService } from '../../surbtc/surbtc.service';
import {Observable} from "rxjs";

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

  private prices = [];

  constructor(private surbtcService: SurbtcService) {
    this.surbtcService = surbtcService;
  }

ngOnInit(){
  this.surbtcService.getPricess()
  .subscribe(
    data => this.prices = data.ticker
  );
}
}

Answer 1

如果希望将price作为数组，则在prices数组中有push对象。

ngOnInit(){
  this.surbtcService.getPricess()
  .subscribe(
    data => this.prices.push(data.ticker);
  );
}

或者，您可以通过将data.ticker分配给prices直接访问对象属性。

private prices = new SurbtcMarketView();

constructor(private surbtcService: SurbtcService) {

}
ngOnInit(){
   this.surbtcService.getPricess()
        .subscribe(data =>{
            this.prices = data.ticker;
        });
}

HTML：

<div *ngFor="let item of prices.min_ask">
  {{item}}
</div>

更新：

请参阅Plnkr 演示，我已经解决了在解析json响应时导致错误的问题。

Answer 2

否则你也可以用这个，

prices : SurbtcService[] = [];

然后您可以将用户对象推送到数组中，

this.prices.push(<<the data you want to push>>);