[orientationchange] 디바이스 방향 바뀌는 것 감지 🔁
orientationchange
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screen.addEventListener("orientationchange", function () {
alert("the orientation of the device is now " + window.orientation);
});
screen.orientation 이 아닌 window.orientation 사용
세로모드 : window.orientation = 0 가로모드 : window.orientation = 90 || -90
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