如何在angular 2中使用自定义http刷新访问令牌？

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class TokenInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 获取访问令牌
    const accessToken = this.getAccessToken();

    // 克隆请求并添加访问令牌到请求头
    const authRequest = request.clone({
      setHeaders: {
        Authorization: `Bearer ${accessToken}`
      }
    });

    // 继续处理请求
    return next.handle(authRequest);
  }

  private getAccessToken(): string {
    // 在这里实现获取访问令牌的逻辑，可以从本地存储、Cookie等地方获取
    // 返回访问令牌字符串
    return 'your-access-token';
  }
}

import { NgModule } from '@angular/core';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { TokenInterceptor } from './token.interceptor';

@NgModule({
  imports: [HttpClientModule],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: TokenInterceptor,
      multi: true
    }
  ]
})
export class AppModule { }