Angular 2:将数据从父级传输到子级

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

@Component({
  selector: 'app-parent',
  template: `
    <h1>父级组件</h1>
    <app-child [message]="parentMessage"></app-child>
  `
})
export class ParentComponent {
  parentMessage = '这是来自父级组件的消息';
}

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

@Component({
  selector: 'app-child',
  template: `
    <h2>子级组件</h2>
    <p>{{ message }}</p>
  `
})
export class ChildComponent {
  @Input() message: string;
}