let str = "10001";
                  let buf = new ArrayBuffer(str.length); // 每个字符占用2个字节
                  let bufView = new Uint8Array(buf);
                  for (var i=0, strLen=str.length; i<strLen; i++) {
                    bufView[i] = str.charCodeAt(i);
                  }
                  console.log(buf);
                  nfcA.transceive({
                    data:buf,
                    success:function(res){
                      console.log("transceive success");
                      console.log(res);
                    },
                    fail:function(res){
                      console.log("transceive fail");
                      console.log(res);
                    },
                    complete:function(res){
                      console.log("transceive complete");
                      console.log(res);
                    }
                  });

https://developers.weixin.qq.com/miniprogram/dev/api/device/nfc/NfcB.transceive.html

错误信息：{errMsg: "transceive:fail:system internal error", errCode: 13017}

NFC的文档是否完善一下，完全靠自己摸索