Detecting Mobile Devices with JavaScript

example.js

// To check to see if the user is on any of the supported mobile devices:
if (isMobile.any()) { alert('Mobile'); }
// To check to see if the user is on a specific mobile device:
if (isMobile.iOS()) { alert('iOS'); }

ismobile.js

//
// While I understand and value the concept of feature detection over browser detection, 
// sometimes the need for knowing whether or not we’re dealing with a mobile device arises.
// For in-depth device checking, you can rely on a complex library such as The MobileESP Project.
// But for simpler applications, the following snippet can be useful.
//

var isMobile = {
    Android: function() {
        return navigator.userAgent.match(/Android/i);
    },
    BlackBerry: function() {
        return navigator.userAgent.match(/BlackBerry/i);
    },
    iOS: function() {
        return navigator.userAgent.match(/iPhone|iPad|iPod/i);
    },
    Opera: function() {
        return navigator.userAgent.match(/Opera Mini/i);
    },
    Windows: function() {
        return navigator.userAgent.match(/IEMobile/i);
    },
    any: function() {
        return (
            isMobile.Android() || 
            isMobile.BlackBerry() || 
            isMobile.iOS() || 
            isMobile.Opera() || 
            isMobile.Windows()
        );
    }
};