js手机屏幕旋转判断

/*
**设备旋转提示
*/
/*
	$(function(){
		var bd = $(document.body);
		window.addEventListener('onorientationchange' in window ? 'orientationchange' : 'resize', _orientationchange, false);
		function _orientationchange() {
			scrollTo(0, 1);
			switch(window.orientation){
				case 0:		//横屏
					bd.addClass("landscape").removeClass("portrait");
					init_pageH();					
					break;
				case 180:	//横屏
					bd.addClass("landscape").removeClass("portrait");	
					init_pageH();
					break;

				case -90: 	//竖屏

					init_pageH();
					//bd.addClass("portrait").removeClass("landscape");
					if($(".m-video video")[0]!=undefined && $(".m-video video")[0].paused){
							 alert("请竖屏查看页面，效果更佳");
					}else{
							alert("请竖屏查看页面，效果更佳");
					}

					break;
				case 90: 	//竖屏
					init_pageH();
					bd.addClass("portrait").removeClass("landscape");
					if($(".m-video video")[0].paused)
					alert("请竖屏查看页面，效果更佳");
					break;
			}
		}
		$(window).on('load',_orientationchange);
	});