检测由父角度2触发的子组件变量的变化

我正在从app发送一个变量给孩子,我想检测变量的任何变化并相应地显示数据.我无法检测到变量的变化.

任何帮助？我附上了Plunker Link,我还在评论中解释了我想在Child.ts文件中做什么

App.ts文件

//our root app component
import {Component,NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {ChildCom} from './child.ts'

@Component({
    selector: 'my-app',template: `
    <div>
        <h2>Hello</h2>
        <child-com newdata={{data}}></child-com>
    </div>
    `,})
export class App {
    data: any = [];

      constructor(){
          this.data = [{"name":"control","status":"false"}];
    }
}

@NgModule({
    imports: [ BrowserModule ],declarations: [ App,ChildCom ],bootstrap: [ App ]
})
export class AppModule {}

Child.ts文件

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

@Component({
  selector: 'child-com',template: `
    <div>
      <p>Controls: {{newdata}}</p>
    </div>
  `,})

export class ChildCom {
  @Input() newdata: any = [];

  constructor(){
  }

  // here I want to check if value of control in newdata variable is false 
  // then display message on front end "your controls are not working"
  // if value of control in newdata variable is true
  // then display message on front end "your controls are working fine."
  // this should automatically happen whenever I change the value of newdata variable
}

Plunker Link