Javascriptでデバイスがiosかどうか判別

gistfile1.js

// 出所：http://stackoverflow.com/questions/9038625/detect-if-device-is-ios

var iOSversion = false,
    w = window,
    p = navigator.platform;

if( p === 'iPad' || p === 'iPhone' || p === 'iPod' ){
    !!w.history && !!w.history.pushState ? iOSversion = '4+' : iOSversion = '4-';
    !!w.matchMedia ? iOSversion = '5+' : '';
}


// Another way to do it is using navigator.appVersion:

var iOSversion = false,
    p = navigator.platform;

if( p === 'iPad' || p === 'iPhone' || p === 'iPod' ){
    iOSversion = navigator.appVersion.split(' ')[0] || false;
}