let buffer = new ArrayBuffer(4)

    let dataView = new DataView(buffer)

    console.log(dataView)

    dataView.setUint8(0, 0XFA)

    dataView.setUint8(1, 0x01)

    dataView.setUint8(2, 0x01)

    dataView.setUint8(3, 0XAF)

    wx.writeBLECharacteristicValue({

      deviceId: this._serviceId,

      serviceId: this._deviceId,

      characteristicId: this._characteristicId,

      value: buffer

    })

返回10002异常