<talk-cmp [talk]="someExp" (rate)="eventHandler($event.rating)">

import {Component} from "@angular/core";
@Component({
  selector: "my-father",
  templateUrl: "father.html"
})
export class FatherComponent {
  data: Array<Object>;
  constructor() {
    this.data = [
      {
        "id": 1,
        "name": "html"
      },
      {
        "id": 2,
        "name": "css"
      },
      {
        "id": 3,
        "name": "angular"
      },
      {
        "id": 4,
        "name": "ionic"
      },
      {
        "id": 5,
        "name": "node"
      }
    ]
  }
}

<h1>父组件</h1>
// 包含子组件， 并使用属性传递数据过去
<my-child [info]="data"></my-child>

import {Component, Input} from "@angular/core";
@Component({
  selector: "my-child",
  templateUrl: "child.html"
})
export class ChildComponent {  
  // 使用@Input获取传递过来的数据
  @Input()
  info: Array<Object>;
  constructor() {
  
  }
}

<ul>
  <li *ngFor="let item of info">
    {{item.name}}
  </li>
</ul>

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

export class ThreeLinkComponent {
  province: string;
  // 输出一下参数
  @Output() provinceOut = new EventEmitter();  
  constructor() {
    this.province = "陕西";
  } 
}

provinceChange() {
  // 选择省份的时候发射省份给父组件
  this.provinceOut.emit(this.province);
}

<!--三级联动组件-->
<three-link (provinceOut)="recPro($event)"></three-link>

// 函数接受子函数传递过来的变量， 子函数中emit的时候触发这个函数。
recPro(event) {
  this.province = event;
}