javascript로 user agent 변경하기

window.navigator.__defineGetter__('userAgent', function () {

    return 'Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Mobile/9B206 CUSTOM';

});

출처 : https://www.telerik.com/forums/is-it-possible-to-change-the-useragent-