如何设置全局变量来包含方法- Angular 6服务返回的数据？

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class GlobalService {
  private globalData: any;

  constructor() { }

  setGlobalData(data: any) {
    this.globalData = data;
  }

  getGlobalData() {
    return this.globalData;
  }
}

import { Component } from '@angular/core';
import { GlobalService } from './global.service';

@Component({
  selector: 'app-example',
  template: `
    <div>{{ globalData }}</div>
  `
})
export class ExampleComponent {
  globalData: any;

  constructor(private globalService: GlobalService) {
    this.globalData = this.globalService.getGlobalData();
  }
}

import { Component } from '@angular/core';
import { GlobalService } from './global.service';

@Component({
  selector: 'app-example',
  template: `
    <button (click)="getData()">Get Data</button>
  `
})
export class ExampleComponent {
  constructor(private globalService: GlobalService) { }

  getData() {
    // 调用服务的方法获取数据
    // 假设返回的数据为response
    this.globalService.setGlobalData(response);
  }
}