Travel itinerary code has location function, which will show every place you have been in 14 days. It has not been refreshed, so users are advised to refresh. After the health code is launched, during the epidemic period, the dynamic management of green, yellow and red can be used to judge the state of each citizen during the epidemic prevention and control, and highlight the code to enter and leave residential quarters, offices, restaurants and other occasions for the convenience of the masses.