A stylus is used in an electronic device. The electronic device includes a navigation key. The stylus includes a barrel, a tip portion; and a connecting assembly. The tip portion can be detachably attached to an end of the barrel. The connecting assembly includes a main post and four resisting arms, and connects to the other end of the barrel, and the resisting arms are rotatably seated on the tip portion. When the stylus is used as a joystick, the resisting arms are rotated about 90° to form a cross shape, the tip portion is attached to the main post, and the resisting arms latch to the navigation key. The present disclosure further discloses an electronic device using the stylus.