官方文档 MDN window.orientation
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>横竖屏检测</title>
<style>
.box {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.3);
display: flex;
}
.box span {
margin:auto;
font:15px/40px "Songti SC";
color: #fff;
}
</style>
</head>
<body>
<div class="box"><span>为了更好的观看体验，请在竖屏下浏览</span></div>
<script>
/*
* alert(window.orientation)
* window.orientation
* 横屏：90，-90
* 竖屏：0，180
*
* */
toOrientation()
window.addEventListener('orientationchange', toOrientation)
function toOrientation() {
const box = document.querySelector('.box')
if (Math.abs(window.orientation) === 90) {
box.style.display = 'flex'
} else {
box.style.display = 'none'
}
}
</script>
</body>
</html>
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