The maintenance of elevators includes: 

1. Regular inspection: Elevators need to be inspected regularly to ensure their safety and reliability. The inspection includes mechanical components, electrical components, control systems, etc. of the elevator. 

2. Regular maintenance: Elevators require regular maintenance to extend their service life and maintain their performance. The maintenance content includes mechanical components, electrical components, control systems, etc. of the elevator. 

3. Emergency maintenance: In case of elevator malfunction or other emergency situations, timely maintenance is required to ensure the safety of passengers. 

4. Component replacement: The components of the elevator will wear out over time and need to be replaced in a timely manner to maintain the performance and safety of the elevator. 

5. Cleaning and maintenance: Elevators need to be regularly cleaned and maintained to keep them clean and tidy, while also helping to extend their service life. 

The safety standards and regulations for elevators include: 

1. GB 7588-2003 "Elevator Safety Code": This is the basic standard for elevator safety in China, which specifies the requirements for elevator design, manufacturing, installation, use, maintenance, and inspection. 

2. EN 81-1/2: This is the European standard for elevator safety, which specifies requirements for the design, manufacturing, installation, use, maintenance, and inspection of elevators. 

3. ASME A17.1: This is the safety standard for elevators in the United States, which specifies requirements for elevator design, manufacturing, installation, use, maintenance, and inspection. 

In addition to the above standards and regulations, there are other elevator safety standards and regulations in different countries and regions.