小程序求助:蓝牙写入成功读取不到没有这个参数

如何看待微信公开课小程序热门讨论「小程序求助:蓝牙写入成功读取不到没有这个参数」
摘要：小程序求助:蓝牙写入成功读取不到没有这个参数
展开：varbuffernewArrayBuffer(16)vardataViewnewDataView(buffer)varstr0xd3,0x80,0x60,0x79,0x76,0xc9,0xdd,0x46,0xe5,0x18,0xf4,0x31,0xf6,0x4e,0xb6,0x44;vararrstr.split(,)varval;for(vari0;iarr.length;i++){valparseInt(arr[i],16)dataView.setInt8(i,val);}wx.writeBLECharacteristicValue({deviceId:that.data.deviceId,serviceId:that.data.services,characteristicId:that.data.characteristicsFEC7,value:buffer,success:function(res){console.log(res,writeBLECharacteristicValuesuccess);//启用低功耗蓝牙设备特征值变化时的notify功能wx.notifyBLECharacteristicValueChanged({deviceId:that.data.deviceId,serviceId:that.data.services,characteristicId:that.data.characteristicsFEC8,state:true,success:function(res){console.log(notifyBLECharacteristicValueChanged,res);},fail:function(res){console.log(uuidblecvcfail888888888,res);},});//必须在这里的回调才能获setTimeout(function(){wx.onBLECharacteristicValueChange(function(characteristic){console.log(onBLECharacteristicValueChang:,characteristic);constbase64Array.prototype.map.call(newUint8Array(characteristic.value),x(00+x.toString(16)).slice(2)).join();console.log(base64)})},3000)setTimeout(function(){//读取低功耗蓝牙设备的特征值的二进制数据值wx.readBLECharacteristicValue({deviceId:that.data.deviceId,serviceId:that.data.services,characteristicId:that.data.characteristicsFEC9,success:function(res){console.log(readBLECharacteristicValue++++++++++++++++++++++:,res)},fail:function(res){console.log(readBLECharacteristicValuefail:,res)},})},3000)},fail:function(res){console.log(res,bufffail)}})readBLECharacteristicValue成功后不应该返回两个参数吗characteristicobject设备特征值信息errMsgstring成功：ok，错误：详细信息我怎么都没有characteristic这个参数只有errMsg与errcode++++加号后面的是我的返回值了解更多