The commodity bar code adopts EAN- 13 code (EAN- 13 international commodity bar code) or EAN-8 code (EAN-8 international commodity bar code) \x0d\ EAN- 13 bar code, which originated in Europe and developed on the basis of UPC-A bar code. It consists of enterprise identification code+product code+inspection code. \x0d\\x0d\ The barcode type of books and publications is EAN- 13, which consists of 977/978/979+ISBN. The full name of ISBN is "International Standard Book Number", with *** 10 digits. Composition of book bar code: \ x0d \ x0d \ The first three digits are 978 or 979, representing books; \x0d\\x0d\ The 4th to 8th digits represent regions, such as 7 represents China publications, with at least 1 digit and at most 5 digits; \x0d\\x0d\ 5~ 10 is the publishing house code, with at least 2 digits and at most 5 digits. The fewer digits, the bigger the publishing house; \x0d\\x0d\ The 6th to 12 digits are the book serial number, which is given by the publishing house, with the shortest 1 digit and the longest 6 digits; \ x0d \ x0d \ bit13 is the check code, which is automatically calculated according to the first 12 bits.