忘记带上代码了 registerNotify() { return new Promise((resolve, reject) => {             wx.notifyBLECharacteristicValueChange({                 state: true,                 deviceId: this.deviceId, serviceId: serviceId,                 characteristicId: readCharacteristic,                 success: (res) => {                     resolve(res);                 }, error: (err) => {                     reject(err);                 }             })         }) }