如何选择Angular 6中动态创建的子组件中的所有元素？

import { Component, ViewChild } from '@angular/core';
import { ChildComponent } from './child.component';

@Component({
  selector: 'app-parent',
  template: `
    <app-child></app-child>
  `
})
export class ParentComponent {
  @ViewChild(ChildComponent) childComponent: ChildComponent;
}

import { Component, ViewChild, AfterViewInit } from '@angular/core';
import { ChildComponent } from './child.component';

@Component({
  selector: 'app-parent',
  template: `
    <app-child></app-child>
  `
})
export class ParentComponent implements AfterViewInit {
  @ViewChild(ChildComponent) childComponent: ChildComponent;

  ngAfterViewInit() {
    // 访问子组件中的元素
    console.log(this.childComponent.childElementRef.nativeElement);
  }
}