我的 API 服务出现问题。该服务连接到我的 Nodejs 后端 api。
错误说
ERROR TypeError: res.json is not a function
最近更新此服务以使用 HTTPClient 而不是 Http 后,我收到此错误。我收到这个回复是因为我错过了旧的 http 和新的 http?如果是这种情况,是否有新的响应,我该如何使用它?
import { Injectable } from '@angular/core';
import { environment } from '../../environments/environment';
import { HttpHeaders, HttpClient, HttpParams } from '@angular/common/http';
import { Response } from '@angular/http';
import { Observable } from 'rxjs/Rx';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import { JwtService } from './jwt.service';
@Injectable()
export class ApiService {
constructor(
private http: HttpClient,
private jwtService: JwtService
) {}
private setHeaders(): HttpHeaders {
const headersConfig = {
'Content-Type': 'application/json',
'Accept': 'application/json'
};
if (this.jwtService.getToken()) {
headersConfig['Authorization'] = this.jwtService.getToken();
}
return new HttpHeaders(headersConfig);
}
private formatErrors(error: any) {
return Observable.throw(error.json());
}
get(path: string, httpParams: HttpParams = new HttpParams()): Observable<any> {
return this.http.get(`${environment.api_url}${path}`, { headers: this.setHeaders(), params: httpParams })
.catch(this.formatErrors)
.map((res: Response) => res.json());
}
put(path: string, body: Object = {}): Observable<any> {
return this.http.put(
`${environment.api_url}${path}`,
JSON.stringify(body),
{ headers: this.setHeaders() }
)
.catch(this.formatErrors)
.map((res: Response) => res.json());
}
post(path: string, body: Object = {}): Observable<any> {
return this.http.post(
`${environment.api_url}${path}`,
body,
{ headers: this.setHeaders() }
)
.catch(this.formatErrors)
.map((res: Response) => res.json());
}
delete(path): Observable<any> {
return this.http.delete(
`${environment.api_url}${path}`,
{ headers: this.setHeaders() }
)
.catch(this.formatErrors)
.map((res: Response) => res.json());
}
}
HttpClient.get()
适用res.json()
自动并返回Observable<HttpResponse<string>>
。您不再需要自己调用此函数。
See 角度 4 中 HTTP 和 HTTPClient 之间的区别?
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