Bar code is the identity card of goods, which is composed of black and white stripes with different thicknesses. A set of data under the bar code is the code, which represents the same content as the bar code. The code1* * has 13 digits, and the first three digits are 690 to 693, indicating that it is registered and used in Chinese mainland; The first 7 or 8 digits are the manufacturer identification code, that is, the factory of a company; The last five or four digits indicate the characteristics of the commodity and explain what kind of commodity it is; The last bit is the check code recognized by the computer. As a special commodity, the top three books are 978 and magazines are 977.

When the computer in the mall checks out, the scanner scans the bar code. Consumers can benefit from the management of barcode technology. First, it can shorten the queuing time of customers; Second, the accuracy is high, and there is no need to worry about making mistakes when inputting numbers into the computer; Third, the operating cost of the store is reduced, so the commodity price is also reduced; Fourth, improve the shopping environment by adopting the way that consumers choose to sell goods.