如何使用` the library`查找angular中存在的子组件

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;

  ngAfterViewInit() {
    // 在视图初始化之后，可以访问子组件实例
    console.log(this.childComponent);
  }
}

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

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

  ngAfterViewInit() {
    // 在视图初始化之后，可以访问子组件实例的QueryList
    console.log(this.childComponents);
  }
}