how to find device is touch or not

A touchscreen is an input device normally layered on the top of an electronic visual display of an information processing system. A user can give input or control the information processing system through simple or multi-touch gestures by touching the screen with a special stylus/pen and-or one or more fingers. Some touchscreens use ordinary or specially coated gloves to work while others use a special stylus/pen only. The user can use the touchscreen to react to what is displayed and to control how it is displayed .


window.isTouchDevice = function() {
    return (('ontouchstart' in window)
    || (navigator.MaxTouchPoints > 0)
    || (navigator.msMaxTouchPoints > 0));
};