Detects mobile devices — Usage: if ( mobileCheck.ios ) { // Code }

mobileCheck.js

var mobileCheck = {
  ios: (function(){
    return navigator.userAgent.match(/iPhone|iPad|iPod/i);
  }()),
  android: (function(){
    return navigator.userAgent.match(/Android/i);
  }()),
  blackBerry: (function(){
    return navigator.userAgent.match(/BB10|Tablet|Mobile/i);
  }()),
  windows: (function(){
    return navigator.userAgent.match(/IEMobile/i);
  }()),
  smartphone: (function(){
    return (window.innerWidth <= 384 && window.innerHeight <= 640);
  }()),
  tablet: (function(){
    return (navigator.userAgent.match(/Tablet|iPad|iPod/i) && window.innerWidth <= 1280 && window.innerHeight <= 800);
  }()),
  all: (function(){
    return navigator.userAgent.match(/Android|BlackBerry|Tablet|Mobile|iPhone|iPad|iPod|Opera Mini|IEMobile/i);
  }())
};

// OR:

var
    ua = navigator.userAgent,
    browser = /Edge\/\d+/.test(ua) ? 'ed' : /MSIE 9/.test(ua) ? 'ie9' : /MSIE 10/.test(ua) ? 'ie10' : /MSIE 11/.test(ua) ? 'ie11' : /MSIE\s\d/.test(ua) ? 'ie?' : /rv\:11/.test(ua) ? 'ie11' : /Firefox\W\d/.test(ua) ? 'ff' : /Chrome\W\d/.test(ua) ? 'gc' : /Chromium\W\d/.test(ua) ? 'oc' : /\bSafari\W\d/.test(ua) ? 'sa' : /\bOpera\W\d/.test(ua) ? 'op' : /\bOPR\W\d/i.test(ua) ? 'op' : typeof MSPointerEvent !== 'undefined' ? 'ie?' : '',
    os = /Windows NT 10/.test(ua) ? "win10" : /Windows NT 6\.0/.test(ua) ? "winvista" : /Windows NT 6\.1/.test(ua) ? "win7" : /Windows NT 6\.\d/.test(ua) ? "win8" : /Windows NT 5\.1/.test(ua) ? "winxp" : /Windows NT [1-5]\./.test(ua) ? "winnt" : /Mac/.test(ua) ? "mac" : /Linux/.test(ua) ? "linux" : /X11/.test(ua) ? "nix" : "",
    mobile = /IEMobile|Windows Phone|Lumia/i.test(ua) ? 'w' : /iPhone|iP[oa]d/.test(ua) ? 'i' : /Android/.test(ua) ? 'a' : /BlackBerry|PlayBook|BB10/.test(ua) ? 'b' : /Mobile Safari/.test(ua) ? 's' : /webOS|Mobile|Tablet|Opera Mini|\bCrMo\/|Opera Mobi/i.test(ua) ? 1 : 0,
    tablet = /Tablet|iPad/i.test(ua),
    touch = 'ontouchstart' in document.documentElement;