Angular 2+将数据从子组件发送到父组件

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

@Component({
  selector: 'app-child',
  template: `
    <button (click)="sendData()">Send Data</button>
  `
})
export class ChildComponent {
  @Output() data = new EventEmitter<string>();

  sendData() {
    const dataToSend = 'Hello from child component';
    this.data.emit(dataToSend);
  }
}

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

@Component({
  selector: 'app-parent',
  template: `
    <app-child (data)="receiveData($event)"></app-child>
    <p>Received data: {{ receivedData }}</p>
  `
})
export class ParentComponent {
  receivedData: string;

  receiveData(data: string) {
    this.receivedData = data;
  }
}