constructor (private http: Http) {
    //use XHR object
    let _build = (<any> http)._backend._browserXHR.build;
    (<any> http)._backend._browserXHR.build = () => {
        let _xhr =  _build();
        _xhr.withCredentials = true;
        return _xhr;
    };
}

我想将代码移到单独的文件http_base_clas.ts并尽可能地重用代码.这里是http_base_clas.ts：

import {Http} from '@angular/http';
 
export class HttpBaseClass {
    constructor ( http: Http) {
        //use XHR object
        let _build = (<any> http)._backend._browserXHR.build;
        (<any> http)._backend._browserXHR.build = () => {
            let _xhr =  _build();
            _xhr.withCredentials = true;
            return _xhr;
        };
    }
}

如何将http_base_class扩展为auth_service.ts？

import {Injectable} from '@angular/core';
import {Http,Response} from '@angular/http';
import {Headers,RequestOptions} from '@angular/http';
import {Observable} from 'rxjs/Observable';
 
@Injectable ()
 
export class AuthenticationService {
result: {
    ok: boolean;
};
private verifyUrl = 'http:example.com;  
 
constructor (private http: Http) {
 
}
private authRequest (url) {
    let body = JSON.stringify({});
    let headers = new Headers({ 'Content-Type': 'application/json'});
    let options = new RequestOptions({
        headers: headers
    });
    return this.http.post(url,body,options)
        .map((res: Response) => res.json())
        .map(res => {
            this.result = res;
            return this.result.ok;
        });
    }
}