如何在angular2应用程序中获取JSON数组响应数据

我有如下的 JSON 响应。我想要做的是将 JSON 响应输入到我的 angular2 应用程序中。但我无法获得预期的输出。请对我的编码解决方案提出意见。

{
"staffinfo": {
    "id": 3,
    "DeptID": 2,
    "OfficeID": 3,
    "FirstName": "Loreiya",
    "LastName": "Cheng",
    "DOB": "1991-04-02",
    "IsWorking": 1,
    "created_at": "2017-10-22 13:07:15",
    "updated_at": "2017-10-22 13:07:15"
},
"officeinfo": {
    "id": 3,
    "Name": "Finance-Payroll ",
    "Address": "No 20/1, Cross street, dalas, Block A ",
    "Description": "staff salary division ",
    "created_at": "2017-10-24 00:00:00",
    "updated_at": "2017-10-24 00:00:00"
}

}

此数据应显示在我的Department.component.html文件中

 <form #f="ngForm" (ngSubmit)="onSubmit(f)">
  <div class="form-group">
   <label for="depid">Department</label>
    <select name="depid" id="depid" class="form-control" ngModel>
      <option value="1">HR</option>
      <option value="2">Finance</option>
      <option value="3">Marketing</option>
    </select>
  </div>
  <button type="submit" class="btn btn-primary">Search</button>
</form>

<div *ngFor="let dep of department">
  {{ dep.staffinfo }}
</div>

这是我的Department.component.ts文件（我可以在没有任何错误的情况下获得成员发现警报）

import { Component, OnInit, Input } from '@angular/core';
import { NgForm } from "@angular/forms";
import { StaffService } from "../staff.service";
import { Department } from "../department.interface";

@Component({
  selector: 'app-department',
  templateUrl: './department.component.html',
  styleUrls: ['./department.component.css']
})
export class DepartmentComponent implements OnInit {
@Input() department: Department[];

  constructor(private staffService: StaffService) { }

  ngOnInit() {
  }

  onSubmit(form: NgForm) {
    this.staffService.getDept(form.value.depid)
    .subscribe(
      () => alert('Members found')
    );
    form.reset();
  }
}

这是我的staff.service.ts文件来调用后端服务

import { Injectable } from "@angular/core";
import { Http, Response, Headers } from "@angular/http";
import 'rxjs/Rx';
import { Observable } from "rxjs";

@Injectable()
export class StaffService{
  constructor(private http: Http) {
  }

getDept(depid: number): Observable<any>{
    return this.http.get('http://127.0.0.1:8000/api/dept/' + depid)
    .map(
      (response: Response) => {
        return response.json().department;
      }
    );
  }
}

控制台输出

邮递员 JSON 响应

这是我的后端控制器（Laravel 5.4）来调用前端 Angular2 应用程序。

    public function getDeptinfo($id)
   {
     $staffinfo = Staff::find($id);

     if($staffinfo){
         $officeinfo = Office::find($staffinfo['OfficeID']);
     }

     $response = [
         'staffinfo' => $staffinfo,
         'officeinfo' => $officeinfo
     ];

     return response()->json($response, 200);
   }