我正在使用以下代码值,当在this
函数内部调用它时,then
变为空,这是代码。我是在做错事还是类似的事情,或者有任何解决此问题的方法
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Headers, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import { CanActivate, Router } from '@angular/router';
import { AuthService } from '../services/auth.service';
import { WebAPISettings } from '../services/webapisettings.service';
@Injectable()
export class LoginService {
//_ngWEBAPISettings: WebAPISettings;
//_authService: AuthService;
constructor(private http: Http, private ngWEBAPISettings: WebAPISettings, private authService: AuthService) {
//this._ngWEBAPISettings = ngWEBAPISettings;
//this._authService = authService;
}
public login(username: string, password: string): Promise<any> {
let data = "grant_type=password&username=" + username + "&password=" + password;
let headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded' });
let options = new RequestOptions({ headers: headers });
try {
debugger;
return this.http.post(this.ngWEBAPISettings.apiServiceBaseUri + "token", data, options)
.toPromise()
.then(function (res: Response) {
debugger;
let body = res.json();
//let _authService: AuthService = new AuthService();
this.authService.fillAuthDataFromLogin(body);
//this.router.navigate(['/Home']);
return body.data || {};
})
.catch(this.handleError);
}
catch (error) {
console.log(error);
}
}
private extractData() {
}
private handleError(error: any) {
debugger;
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);
}
}
我正在Chrome中调试它,这里是屏幕截图,请帮助我修复它。
使用箭头功能后,请检查屏幕快照
提及一件事,我正在使用Angular2 RC4。
最佳答案
您可以使用箭头功能来使用词汇:
return this.http.post(this.ngWEBAPISettings.apiServiceBaseUri + "token", data, options)
.toPromise()
.then((res: Response) => { // <-----
(...)
});
这样,
this
将对应于LoginService
服务的实例。有关更多详细信息,请参见此文档:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
关于javascript - 在Promise回调中此值变为空,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/38383693/