在Angular 2中使服务变量成为全局变量

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

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

  constructor() { }

  setGlobalVariable(value: any) {
    this.globalVariable = value;
  }

  getGlobalVariable() {
    return this.globalVariable;
  }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppComponent } from './app.component';
import { GlobalService } from './global.service';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule
  ],
  providers: [GlobalService], // 注册全局变量服务
  bootstrap: [AppComponent]
})
export class AppModule { }

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

@Component({
  selector: 'app-root',
  template: `
    <h1>Global Variable: {{ globalVariable }}</h1>
    <button (click)="updateGlobalVariable()">Update Global Variable</button>
  `
})
export class AppComponent {
  globalVariable: any;

  constructor(private globalService: GlobalService) {
    this.globalVariable = this.globalService.getGlobalVariable();
  }

  updateGlobalVariable() {
    this.globalService.setGlobalVariable('New Value');
    this.globalVariable = this.globalService.getGlobalVariable();
  }
}