[원문]http://stackoverflow.com/questions/1649086/detect-rotation-of-android-phone-in-the-browser-with-javascript
[설명] 크롬 <-- 안드로이드 에서 모바일 환경에서 핸드폰 회전할 때  width 값을  구할 수 있는 스크립트


var isMobile = {
    Android: function() {
        return /Android/i.test(navigator.userAgent);
    },
    iOS: function() {
        return /iPhone|iPad|iPod/i.test(navigator.userAgent);
    }
};
if(isMobile.Android())
    {
        var previousWidth=$(window).width();
        $(window).on({
        resize: function(e) {
        var YourFunction=(function(){

            var screenWidth=$(window).width();
            if(previousWidth!=screenWidth)
            {
                previousWidth=screenWidth;
                alert("oreientation changed");
            }

        })();

        }
    });

    }
    else//mainly for ios
    {
        $(window).on({
            orientationchange: function(e) {
               alert("orientation changed");
            }  
        });
    }