A hinge having the characteristics of space-saving and ease of installation is disclosed to include a mounting base member affixed to a base member of a flip-up electronic product, female hinge shafts fixedly mounted in the mounting base member, a male hinge shaft rotatably inserted through the female hinge shafts and connectable to a cover member of the flip-up electronic product, and a lever pivotally mounted at the mounting base member and operable to move the male hinge shaft axially relative to the female hinge shafts between a mounting position where the male hinge shaft is fastened to the cover member of the flip-up electronic product and a dismounting position where the male hinge shaft is disconnected from the cover member.