angular中子组件使用@output向父组件传值

子组件html

<button nz-button (click)="childFunc(2)">按钮</button>

子组件component.ts

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

@Component({
  selector: 'app-child',
  templateUrl: './child.component.html',
  styleUrls: ['./child.component.less']
})
export class ChildComponent implements OnInit {
  @Output() childData=new EventEmitter();
  constructor() { }

  ngOnInit() {
  }

  childFunc(data:number){
    this.childData.emit(data);
  }

}

父组件html

<app-child (childData)="parentFunc($event)"></app-child>
子组件数据{{fromchildData}}

父组件component.ts

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.less']
})
export class AppComponent {
  fromchildData=null;

  parentFunc(childData:number){
    this.fromchildData=childData;
  }
}