son 组件

html

<hr>
<h3>header_html</h3>
<h2>{{title}}</h2>
<h2>{{msg}}</h2>

<button (click)="home_run()">click it..</button>
<br>
<button (click)="home_btn()">home_btn</button>

component.ts

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

@Component({
  selector: 'app-header',
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.less']
})
export class HeaderComponent implements OnInit {

  // 接收父组件传过来的数据
  @Input() title:any;
  @Input() msg:any;
  @Input() home_run:any;
  @Input() home:any;

  constructor() { }

  ngOnInit() {
  }

  runFather_method(){
    this.home_run();
  }

  home_btn(){
    this.home.home_run();
  }

}

father

html

<h1>父组件传值给子组件..</h1>
<app-header [title]="title"  [msg]='msg'  [home_run]='home_run' [home]='this'></app-header>
<!--                                                  把整个 home 组件传给子组件    -->

component.ts

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

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.less']
})
export class HomeComponent implements OnInit {

  public title:string = "home - title";
  public msg:string = "home -- msg ";

  constructor() {}

  ngOnInit() {}

  home_run(){
    alert("i am father run method.....")
  }

}