Ionic 3 network connection check Cant Working on My Localhost

Ionic Framework ionic-v3
1

I have installed Network library too but If i disable or enable my local network connection not show any response on my console window.
Below is the app.componant file below i have write the code whats wrong with my coding please let me know, Help me to resolved these issue…
Thank you in advance!

import { Component } from ‘@angular/core’;
import { Platform, Events } from ‘ionic-angular’;
import { StatusBar } from ‘@ionic-native/status-bar’;
import { SplashScreen } from ‘@ionic-native/splash-screen’;

import { HomePage } from ‘…/pages/home/home’;
import { Network } from ‘@ionic-native/network’;
import { NetworkProvider } from ‘…/providers/network/network’;
@Component({
templateUrl: ‘app.html’
})
export class MyApp {
rootPage:any = HomePage;

constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen, public events: Events,
public network: Network,
public networkProvider: NetworkProvider) {
platform.ready().then(() => {

  // Okay, so the platform is ready and our plugins are available.
  // Here you can do any higher level native things you might need.
  statusBar.styleDefault();
  splashScreen.hide();

  this.network.onConnect().subscribe(()=>{
    console.log('network connected!');
    alert('ok');
  });

  this.network.onDisconnect().subscribe(() => {
    console.log('network was disconnected :-(');
    alert('failed');
  });
});

}
}