this.http.post(url, param, config).subscribe(
 (res) => {
 //...請求成功
 }, (err) => {
 //...請求失敗
 }, () => {
 //...請求完成
 }
 );

export interface OnHttpImp {

 onResult(result: HttpResult, code?: number): void;

 onError?(err：any): void;

 onComplete?(): void;
}

export class HttpResult {
 code?: number;
 data?: any;
 msg?: string;
}

 public post(url: string, param: FormData, callback: OnHttpImp, code?: number) {
 url = Config.base + url;
 const headers = new Headers();
 headers.append('Content-Type', 'application/x-www-form-urlencoded');
 this.http.post(url, param, {}).subscribe(
 (res) => {
 if (code) {
 callback.onResult(res, code);
 } else {
 callback.onResult(res);
 }
 }, (err) => {
 console.log(url + '===>' + JSON.stringify(err));
 }, () => {
 if (callback.onComplete) {
 callback.onComplete();
 }
 }
 );
 }

export class LoginComponent implements OnInit, OnHttpImp {
 public validateForm: FormGroup;
 public username_control: AbstractControl;
 public password_control: AbstractControl;

 constructor(private fb: FormBuilder,
 private http: HttpUtil) {
 }

 ngOnInit() {
 this.validateForm = this.fb.group({
 'userName': [null, [Validators.required]],
 'password': [null, [Validators.required]],
 remember: [true],
 });
 this.username_control = this.validateForm.controls['userName'];
 this.password_control = this.validateForm.controls['password'];
 }


 _submitForm() {
 const params = new FormData();
 const md5 = new Md5();
 const password = md5.appendStr(this.password_control.value).end();
 params.set('username', this.username_control.value);
 params.set('password', password.toString());
 this.http.post('/user/login', params, this);
 }

 onResult(result: HttpResult, code?: number): void {
 //如果多個網(wǎng)絡(luò)請求，需要傳入code值，根據(jù)code值來判斷請求來源
 //swthch(code){
 // case 100:
 // 
 // break;
 //}
 
 // 如果單個請求，直接處理請求結(jié)果。
 // console.log(result)
 
 }
}