Angular2。如何从子组件向父组件传输数据？

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

@Component({
  selector: 'child-component',
  template: `
    <button (click)="sendData()">传输数据</button>
  `
})
export class ChildComponent {
  @Output() dataEvent = new EventEmitter<string>();

  sendData() {
    const data = '这是要传输的数据';
    this.dataEvent.emit(data);
  }
}

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

@Component({
  selector: 'parent-component',
  template: `
    <child-component (dataEvent)="receiveData($event)"></child-component>
    <p>接收到的数据：{{ receivedData }}</p>
  `
})
export class ParentComponent {
  receivedData: string;

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