Angular 2分配问题

Question

我正在尝试分配格式化的值，下面的代码正在按顺序

export class AppComponent {
  public urlObj = this._urlService.get('GET_CLIENT_ID');
  url = this._urlService.formatURL('root', this.urlObj.URL);
  constructor(private _urlService: UrlService) {
  }
 }

但是当我尝试直接更改urlObj.URL时，它不像

那样工作

export class AppComponent {
  public urlObj = this._urlService.get('GET_CLIENT_ID');
  this.urlObj.URL = this._urlService.formatURL('root', this.urlObj.URL);
  constructor(private _urlService: UrlService) {
  }
}

这是Unexpected token at this.urlObj

Answer 1

您的_urlService在构造函数级别初始化。尝试在其中进行赋值操作：

export class AppComponent {
  public urlObj; 

  constructor(private _urlService: UrlService) {
   this._urlService.get('GET_CLIENT_ID');
   this.urlObj.URL = this._urlService.formatURL('root', this.urlObj.URL);
  }