js和css判断屏幕方向

1，js判断横竖屏幕

window.addEventListener("orientationchange", function() {

    alert(window.orientation);

}, false);

2，css判断横竖屏幕

/* portrait 竖屏*/

@media screen and (orientation:portrait) {

    

}

/* landscape  横屏*/

@media screen and (orientation:landscape) {

    

}