wx.BLEcharacterticValue+read 多次调用的问题？

目的：我要获取‘0000FFF0-0000-1000-8000-00805F9B34FB’下FFF2和FFF6的特征值并赋值。

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直接上代码：

// (function(){     //获取特征值     wx.getBLEDeviceCharacteristics({       deviceId,       serviceId: '0000FFF0-0000-1000-8000-00805F9B34FB',       success: function (res1) {         console.log('chara_res:', res1)           var charaArr = res1.characteristics[2]           wx.onBLECharacteristicValueChange(function (res1) {           var temp1 = ab2hex(res1.value)           console.info('pfmc1:', temp1)           var power = (temp1[0] * 16 + temp1[1] * 1)             //设置渲染层参数power           _this.setData({             power,           })           console.info("hextodec:", power)         })           wx.readBLECharacteristicValue({           deviceId,           serviceId,           characteristicId: charaArr.uuid,           success: function (res1) {             console.log('readBLECharacteristicValue:', res1.errCode)           },         })       },     })   // })();     // (function(){     //获取特征值     wx.getBLEDeviceCharacteristics({       deviceId,       serviceId: '0000FFF0-0000-1000-8000-00805F9B34FB',       success: function (res2) {         console.log('chara_res:', res2)           var charaArr = res2.characteristics[6]         // console.info('charaarr:', charaArr)           wx.onBLECharacteristicValueChange(function (res2) {           var temp2 = ab2hex(res2.value)           console.info('pfmc2:', temp2)             var interval = (temp2[0] * 16 + temp2[1] * 1)           //设置渲染层参数interval           _this.setData({             interval,           })             console.info("hextodec:", interval)         })           wx.readBLECharacteristicValue({           deviceId,           serviceId,           characteristicId: charaArr.uuid,           success: function (res2) {             console.log('readBLECharacteristicValue:', res2.errCode)           },         })       },     })   // })();

1、日志打印输出了两次pfmc2：？？？---------------------------------------------------------------

    理论上应该输出pfmc1：第一次数据；pfmc2：第二次数据。

    应该怎么修改可以分别获取FFF2,FFF6的特征值数据并赋值？