Angular EventEmitter不发出数组的任何更改

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

@Injectable()
export class ArrayService {
  private array: any[] = [];
  private arraySubject: Subject<any[]> = new Subject<any[]>();

  getArray(): any[] {
    return this.array;
  }

  updateArray(newArray: any[]): void {
    this.array = newArray;
    this.arraySubject.next(this.array);
  }

  getArrayChanges(): Observable<any[]> {
    return this.arraySubject.asObservable();
  }
}

import { Component, OnInit } from '@angular/core';
import { ArrayService } from 'path-to-array-service';

@Component({
  selector: 'app-example-component',
  template: `
    <div *ngFor="let item of array">{{ item }}</div>
  `
})
export class ExampleComponent implements OnInit {
  array: any[];

  constructor(private arrayService: ArrayService) { }

  ngOnInit(): void {
    this.array = this.arrayService.getArray();
    this.arrayService.getArrayChanges().subscribe((newArray) => {
      this.array = newArray;
    });
  }
}