在Ionic 3中检查互联网连接：它真的有效吗？

Question

我正在尝试在我的应用中查看我的设备上的互联网连接。

我一直在看ionic documentation

我编写了以下代码并且可以正常工作

// watch network for a disconnect
let disconnectSubscription = this.network.onDisconnect().subscribe(() => {
  console.log('network was disconnected :-(');
});

// stop disconnect watch
disconnectSubscription.unsubscribe();

// watch network for a connection
let connectSubscription = this.network.onConnect().subscribe(() => {
  console.log('network connected!');

});

// stop connect watch
connectSubscription.unsubscribe();

然后我尝试在我自己的功能中使用它

//import
import { Network } from '@ionic-native/network';



//declare
public check : boolean = true;
public check2 : boolean = false;


//constructor
  constructor(public http: Http,private network: Network) {
    
  }
  
 //functions
 
  isOffline(){
  
        let disconnectSub = this.network.onDisconnect().subscribe(() => {
            this.check = false
          });
        disconnectSubscription.unsubscribe();
  
 
    return check;
  }
  
  
  
  isOnline(){
  
        let connectSub = this.network.onConnect().subscribe(()=> {
            this.check2 = true;
          });

        connectSubscription.unsubscribe();
  
 
    return check;
  }
  
  
  
  

然后我从一个按钮调用我使用console.log()，但有关连接的数据不正确