判断蓝牙是否连接成功并获取设备名称？

wx.openBluetoothAdapter({  //蓝牙是否开启
      success(res) {
        wx.getBluetoothAdapterState({ //蓝牙是否连接成功
          success (res) {
            console.log(res)
          }
        })
        console.log(res.errMsg)
      }
    })
w无论是否连接成功都是