将此angular2服务从Observable的官方文档中获取,尝试修改为可以传递给 app/heroes/{{country}}
这样的基础 heroesUrl
动态参数并使用它像
getHeroes(country) {}
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Hero } from './hero';
import { Observable } from 'rxjs/Observable';
@Injectable()
export class HeroService {
constructor (private http: Http) {}
private heroesUrl = 'app/heroes'; // URL to web API
getHeroes (): Observable<Hero[]> {
return this.http.get(this.heroesUrl)
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
let body = res.json();
return body.data || { };
}
private handleError (error: any) {
// In a real world app, we might use a remote logging infrastructure
// We'd also dig deeper into the error to get a better message
let errMsg = (error.message) ? error.message :
error.status ? `${error.status} - ${error.statusText}` : 'Server error';
console.error(errMsg); // log to console instead
return Observable.throw(errMsg);
}
}
我该怎么办?
1 回答
如果我理解你的观点,我认为你只需要做一些事情,