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我试图使http调用,如果将有任何错误做我的事情。在http获取错误获得
这里是我的代码:
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/throw';
// Operators
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/switchMap';
import 'rxjs/add/operator/toPromise';
@Injectable()
export class HttpCallService {
constructor(private http: Http) { }
getHeroes(): Observable<Hero[]> {
console.log('entered');
return this.http.get('Url')
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
console.log('extract entered');
let body = res.json();
return body.data || {};
}
private handleError(error: Response | any) {
console.log('error entered');
let errMsg: string;
if (error instanceof Response) {
const body = error.json() || '';
const err = body.error || JSON.stringify(body);
errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
} else {
errMsg = error.message ? error.message : error.toString();
}
console.error(errMsg);
return Observable.throw(errMsg);
}
}
export class Hero {
constructor(
public id: Date,
public author: string,
public text: string
) { }
}
当我喊它,它在控制台日志中唯一进入这在getHeroes。我知道会有错误,我没有有效的网址,但为什么它不去抓?