Shanghai Tongji University can leave school. There is no need to go through the formalities when you leave school. The school will designate a gate that is open 24 hours a day. However, during the current epidemic, the school's management of students leaving Shanghai is still relatively strict.
You must apply to the school or counselor in advance to explain the reason for leaving Shanghai. The school will also make it clear to students not to leave Shanghai unless necessary. Don't go to high-risk areas, or you will bring risks to yourself and others.