JavaScript: Detect iPhone/iPad Types

test.js

var pixelRatio = window.devicePixelRatio || 1;

var viewport = {
width: window.innerWidth,
height: window.innerHeight
};

var screen = {
width: window.screen.availWidth * pixelRatio,
height: window.screen.availHeight * pixelRatio
};

var iPhone = /iPhone/i.test(navigator.userAgent);
var iPhone4 = (iPhone && pixelRatio == 2);
var iPhone5 = /iPhone OS 5_0/i.test(navigator.userAgent); // ?
var iPad = /iPad/i.test(navigator.userAgent);
var android = /android/i.test(navigator.userAgent);
var webos = /hpwos/i.test(navigator.userAgent);
var iOS = iPhone || iPad;
var mobile = iOS || android || webos;