Prompt method and device for refrigerator and refrigerator

A method for a refrigerator comprising a prompt device comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the method comprising the following steps:

• establishing a dish database according to menu query information of a user, wherein the dish database comprises dishes and foods corresponding to the dishes;
• monitoring that the refrigerator sequentially passes through a door closing state, a door opening state and a door closing state;
• reading an electronic tag arranged on food and recording corresponding reading time, wherein the reading time is a time when the food enters the refrigerator, and the electronic tag comprises name, type, production date and shelf life of the food;
• establishing a food database according to each food in the refrigerator and the time when the food enters the refrigerator;
• detecting food in a current refrigerator, wherein each food in the refrigerator is matched with a corresponding dish according to a dish database, and prompt information is obtained according to the time when the food enters the refrigerator in the food database;
• and
• prompting with the prompt information on the prompt device;
• the prompt information includes an expected expiration time and recommended dishes;
• wherein the prompt information is obtained by the refrigerator according to the time when the food enters the refrigerator in the food database;
• wherein the method further comprises:
• calculating Ei=Bi−Ji−a to obtain the expected expiration time when the food is non-packaged food, and calculating Ei=Bi−Si to obtain the expected expiration time when the food is packaged food;
• obtaining the time when the corresponding food is in the refrigerator according to the time when the food enters the refrigerator by the refrigerator;
• and
• displaying the prompt information on a display screen of the refrigerator when the expected expiration time Ei is less than or equal to the set threshold value;
• wherein Ei is the expected expiration time, Bi is a shelf life, Ji is a time the food is in the refrigerator, a is a type reference time, and Si is a production date, a>0, i>0;
• wherein when the food is the non-packaged food, a number of times a door is opened and closed results in a change in the type reference time.