<camera mode='scanCode' class="camera" device-position="front" flash="auto" @scancode="bindscancode" style="width:600rpx; height: 600rpx;"></camera> 项目使用了uniapp作为框架开发的 使用小米13测试无法调用前置摄像头

  writeBLECharacteristicValue() {     // 向蓝牙设备发送一个0x00的16进制数据     function stringToCmdBuffer(inputstr) {       return new Uint8Array(inputstr.match(/[\da-f]{2}/gi).map(function (h) {         return parseInt(h, 16)       })).buffer     }     wx.writeBLECharacteristicValue({       deviceId: this._deviceId,       serviceId: this._serviceId,       characteristicId: this._characteristicId,       value: stringToCmdBuffer('565656').slice(0, 20),       success: (res) => {         console.log('success');       },       complete: (res) => {         console.log('complete', res);       }     })   },