如何使用Angular 4在启动会话时获取客户端的IP地址

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class IpService {
  constructor(private http: HttpClient) { }

  getIpAddress() {
    return this.http.get('https://api.ipify.org?format=json');
  }
}

import { Component } from '@angular/core';
import { IpService } from './ip.service';

@Component({
  selector: 'app-root',
  template: `
    <div>
      Client IP Address: {{ ipAddress }}
    </div>
  `
})
export class AppComponent {
  ipAddress: string;

  constructor(private ipService: IpService) {
    this.ipService.getIpAddress().subscribe((response: any) => {
      this.ipAddress = response.ip;
    });
  }
}