An enclosure includes a chassis, a locking member, a top panel and a detaching member. The chassis includes a rear wall. The locking member is attached to the rear wall. The top panel is attached to the chassis. The top panel includes a hook. A through opening is defined in the top panel. The detaching member is rotatable relative to the top panel. The detaching member includes a tab and an operating portion. The detaching member extends through the through opening. The tab and the operating portion are located at opposite sides of the top panel.