Sencha Touch 判断横竖屏

  Ext.Viewport.on('orientationchange',function(){               var me=this,c=me.down('myCarousel');            var screen = (window.innerWidth > window.innerHeight) ? "portrait" :"landscape";            if(screen=='portrait'){        c.hide();            }else if(screen=='landscape'){        c.show();            }            window.localStorage.setItem("screen", screen);        })