onBluetoothDeviceFound 监听为什么会返回两条相同数据?

wx.onBluetoothDeviceFound((res) => {

          res.devices[0].RSSI = BlueTooth.max(0, res.devices[0].RSSI + 100)

          res.devices[0].advertisData = BlueTooth.ab2hex(res.devices[0].advertisData).slice(4, 16)

          if (res.devices[0].advertisData == mac) {

            this.stopBluetoothDevicesDiscovery()

            console.log(res.devices[0].advertisData, mac,res.devices[0].deviceId ,‘xxxxx’)

          }

        })