单片机的双精度实型数double存储格式是8个字节，当上传至后台电脑时，需要将以长整数表示形式转换成为实型数，该程序函数提供了转换方法-The single-chip double-precision real number double the storage format is 8 bytes, when uploaded to the background when the computer requires that the form will be a long integer type is converted to become the number, the program provides a conversion function