Angular 2:当你不知道childComponent组件的类的时候，我该如何把它的属性发送给parent呢？

<app-child-component #child></app-child-component>

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

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

  sendChildPropertiesToParent() {
    const childProperties = this.childComponent.properties;
    // 执行你想要的操作，将childComponent的属性发送给parent组件
  }
}

import { Component, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'app-child-component',
  template: `...`
})
export class ChildComponent {
  @Output() propertiesChange = new EventEmitter<any>();

  // 在适当的时候触发propertiesChange事件，并传递属性值
  triggerPropertiesChange() {
    const properties = {
      // 设置你想要传递给parent组件的属性值
    };

    this.propertiesChange.emit(properties);
  }
}

<app-child-component (propertiesChange)="handleChildPropertiesChange($event)"></app-child-component>

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

@Component({
  selector: 'app-parent-component',
  template: `
    <app-child-component (propertiesChange)="handleChildPropertiesChange($event)"></app-child-component>
  `
})
export class ParentComponent {
  handleChildPropertiesChange(properties: any) {
    // 处理childComponent的属性变化事件，接收传递的属性值
  }
}