angular 路由守卫Observable异步请求串联

假设路由守卫有这种场景

需要使用observable同时发送多个Http 请求，判断request2返回的数据中是否存在request1返回的数据

使用async await

export class testAuth implements CanActivate {
  username = localStorage.getItem("username");
  EmployeeNo: any;
  constructor(
    private dpaService: DpaService,
    private testService: TestService,
    ) { }
   async canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Promise<boolean | UrlTree> {
     try{
        if(this.username){
        //forkJoin同时发送多个http请求
          return await forkJoin([this.dpaService.getUserByEmail(this.username),this.testService.queryAll()])
          .toPromise().then((results:any)=>{
            //results为多个请求返回的结果数组
            this.EmployeeNo = results[0][0].EmployeeNo;
            return  results[1].filter((element: any)=>element.emplId === this.EmployeeNo).length>0;
          });
        }
        else{
          return false;
        }
      } catch(err){
        return false;
      }
  }
}