HarmonyOS connection监听断网事件

使用 connection 创建网络监听事件，当手机没有电话卡使用移动网络，先连接 wifi，创建监听事件，然后关闭 wifi，不会触发监听的 ‘netUnavailable’ 和 ‘netLost’ 事件

示例代码

function onNetworkStatusChange() {
  let netConnection = connection.createNetConnection();
  netConnection.register((error) => {
    if (error) {
      return
    }
  })
  netConnection.on('netConnectionPropertiesChange', () => {
    console.info("netConnectionPropertiesChange");
  })
  netConnection.on('netBlockStatusChange', () => {
    console.info("netBlockStatusChange");
  })
  netConnection.on('netLost', () => {
    console.info("netLost");
  })
  netConnection.on('netUnavailable', () => {
    console.info("netUnavailable");
  })
  netConnection.on('netCapabilitiesChange', async (data: connection.NetCapabilityInfo) => {
    console.info("Succeeded to get data: " + JSON.stringify(data));
  });
}
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