如何在Angular中从window身份验证中获取用户名？

import { Injectable, Inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';

@Injectable({
  providedIn: 'root'
})
export class AuthService {

  constructor(@Inject(DOCUMENT) private document: Document) { }

  getUsername(): string {
    return this.document.defaultView?.name || '';
  }
}

import { Component } from '@angular/core';
import { AuthService } from './auth.service';

@Component({
  selector: 'app-my-component',
  template: `
    <div>
      Username: {{ username }}
    </div>
  `
})
export class MyComponent {

  username: string;

  constructor(private authService: AuthService) {
    this.username = this.authService.getUsername();
  }
}