如何对监听判断VPN类型网络

connection.getDefaultNet().then((netHandle: connection.NetHandle) => { 
  connection.getNetCapabilities(netHandle).then((data: connection.NetCapabilities) => { 
    const type: Number = data.bearerTypes[0]; 
    if (type === 4) { 
      console.info('is vpn'); 
    } 
  }) 
});