转：window.orientation判断移动设备横屏竖屏

通过window.orientation来判断设备横竖屏
function checkOrient() {

    if (window.orientation == 0 || window.orientation == 180){
        var screenOrientation = 'portrait';
    }
    else if (window.orientation == 90 || window.orientation == -90){
        var screenOrientation = 'landscape';
    }
    return screenOrientation;
}
// 添加事件监听
addEventListener('load', function(){
    checkOrient();
    window.onorientationchange = checkOrient;
});

注：landscape是横向，portrait是纵向

转自：http://www.best-html5.net/?p=661