A vehicle comprising: a vehicle body; a vehicle door disposed to the vehicle body and movable between an open position and a closed position; a running board disposed to the vehicle body and movable between an extended position and a retracted position; an actuator connected to the running board so as to actuate the running board to move between the extended position and the retracted position, wherein the actuator comprises: a retractable mechanism disposed to the vehicle body and connected with the running board so as to drive the running board to move between the extended position and the retracted position; and an electric motor connected with the controller and the retractable mechanism so as to actuate the retractable mechanism to extend and retract, wherein the retractable mechanism comprises a mounting support, a running board support, and an arm assembly connected between the mounting support and the running board support and configured to drive the running board support to move between the extended position and the retracted position; a magnet disposed to the vehicle door; a magnetic induction element disposed to the vehicle body and configured to cooperate with the magnet so as to be triggered to generate a door-opening signal and a door-closing signal; a signal transmission line used to transmit the door-opening signal and the door-closing signal, a first end of the signal transmission line being connected with the magnetic induction element; and a controller disposed to the vehicle body and connected with a second end of the signal transmission line and the actuator, so as to actuate the running board to move between the extended position and the retracted position according to the door-opening signal and the door-closing signal, and characterized by further comprising an elastic member configured to be elastically deformed to store energy when the electric motor actuates the running board support to move towards the extended position and configured to be restored to release the energy when the electric motor actuates the running board support to move towards the retracted position, so as to assist the electric motor to actuate the retractable mechanism, wherein the elastic member is configured as a spiral spring, a first end of the spiral spring being fixed and a second end of the spiral spring being driven to twist by an electric motor shaft of the electric motor. a vehicle body; a vehicle door disposed to the vehicle body and movable between an open position and a closed position; a running board disposed to the vehicle body and movable between an extended position and a retracted position; an actuator connected to the running board so as to actuate the running board to move between the extended position and the retracted position, wherein the actuator comprises: a retractable mechanism disposed to the vehicle body and connected with the running board so as to drive the running board to move between the extended position and the retracted position; and an electric motor connected with the controller and the retractable mechanism so as to actuate the retractable mechanism to extend and retract, a retractable mechanism disposed to the vehicle body and connected with the running board so as to drive the running board to move between the extended position and the retracted position; and an electric motor connected with the controller and the retractable mechanism so as to actuate the retractable mechanism to extend and retract, wherein the retractable mechanism comprises a mounting support, a running board support, and an arm assembly connected between the mounting support and the running board support and configured to drive the running board support to move between the extended position and the retracted position; a magnet disposed to the vehicle door; a magnetic induction element disposed to the vehicle body and configured to cooperate with the magnet so as to be triggered to generate a door-opening signal and a door-closing signal; a signal transmission line used to transmit the door-opening signal and the door-closing signal, a first end of the signal transmission line being connected with the magnetic induction element; and a controller disposed to the vehicle body and connected with a second end of the signal transmission line and the actuator, so as to actuate the running board to move between the extended position and the retracted position according to the door-opening signal and the door-closing signal, and characterized by further comprising an elastic member configured to be elastically deformed to store energy when the electric motor actuates the running board support to move towards the extended position and configured to be restored to release the energy when the electric motor actuates the running board support to move towards the retracted position, so as to assist the electric motor to actuate the retractable mechanism, wherein the elastic member is configured as a spiral spring, a first end of the spiral spring being fixed and a second end of the spiral spring being driven to twist by an electric motor shaft of the electric motor.