orientationchangeのイベント実装方法

orientaitonchange.js

var oldIsPortrait;
$(window)
	.on('resize.orientaionChange', function () {
		var $window = $(window);
		var isPortrait = $window.width() < $window.height();
		if(oldIsPortrait !== isPortrait){
			$window
				.trigger('orientaionChange', (isPortrait) ? 'portrait' : 'landscape');
			oldIsPortrait = isPortrait;
		}
	})
	.on('orientaionChange', function (e, orientaion) {
		console.log(orientaion);
	});