蓝牙写入数据出错uni.writeBLECharacteristicValue

开始写入数据 at utils\util.js:206
uni.writeBLECharacteristicValue 执行这个方法之后就报错了

10:13:47.153 [JS Framework] Failed to execute the callback function:
10:13:47.184 ReferenceError: Can't find variable: that
10:13:47.845 reportJSException >>>> exception function:WEEX_CALL_JAVASCRIPT, exception:JavaScript execute error!ReferenceError: Can't find variable: that
10:13:47.876 getTemplateInfo== template md5 878b5b356f9d640ec6dcd6bc81d51d0f length 16267792 base64 md5 h4tbNW+dZA7G3Na8gdUdDw== response header {"templateSourceBase64MD5":["h4tbNW+dZA7G3Na8gdUdDw=="],"templateSourceMD5":["878b5b356f9d640ec6dcd6bc81d51d0f"]}