1. An eye-tracking method adapted to be implemented by a system, said eye-tracking method comprising: A) while a user is gazing at a screen module and a light source emits light toward an eye of the user, configuring the system to acquire an image of the eye of the user captured by an image-capturing module; B) configuring the system to identify a pupil of and a reflected light spot on the eye from the image acquired in step A); C) configuring the system to determine a distance of the reflected light spot from a reference point on the pupil and an angle of the reflected light spot from an axis passing through the reference point on the pupil; D) configuring the system to determine a gazing point based on the distance and the angle determined in step C) and a pre-established set of data obtained based on predefined regions on the screen module; and E) configuring the system to perform an operation associated with the gazing point.