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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no" />
<title>H5强制竖屏（2019-3-29）</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
@media screen and (orientation: portrait) {
html,
body {
width: 100%;
height: 100%;
}
#print {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: hidden;
background: url(img/login_bg.jpg) no-repeat;
background-size: cover;
}
}
@media screen and (orientation: landscape) {
html,
body {
width: 100%;
height: 100%;
}
#print {
position: absolute;
background: url(img/login_bg.jpg) no-repeat;
background-size: cover;
}
}
</style>
</head>
<body>
<div id="print">
</div>
<script>
//初始化
var width = document.documentElement.clientWidth;
var height = document.documentElement.clientHeight;
var print = document.getElementById("print");
if (width <= height) {
console.log("初始化竖屏");
console.log(width + " " + height);
print.style.width = width + "px";
print.style.height = height + "px";
print.style.top = "0px";
print.style.left = "0px";
print.style.transform = "none";
print.style.transformOrigin = "50% 50%";
}else{
console.log("初始化横屏");
print.style.width = height + "px";
print.style.height = width + "px";
print.style.top = (height - width) / 2 + "px";
print.style.left = -(height - width) / 2 + "px";
print.style.transform = "rotate(90deg)";
print.style.transformOrigin = "50% 50%";
}
var evt = "onorientationchange" in window ? "orientationchange" : "resize";
window.addEventListener(evt, function() {
console.log(evt);
setTimeout(function() { //解决移动端300ms延迟问题(不是最好的方案) 最好的方案是使用FastClick
var width = document.documentElement.clientWidth;
var height = document.documentElement.clientHeight;
if (width > height) {
console.log("横");
console.log(width);
console.log(height);
print.style.width = height + "px";
print.style.height = width + "px";
print.style.top = (height - width) / 2 + "px";
print.style.left = -(height - width) / 2 + "px";
print.style.transform = "rotate(90deg)";
print.style.transformOrigin = "50% 50%";
} else {
console.log("竖")
console.log(width);
console.log(height);
print.style.width = width + "px";
print.style.height = height + "px";
print.style.top = "0px";
print.style.left = "0px";
print.style.transform = "none";
print.style.transformOrigin = "50% 50%";
}
}, 300);
}, false);
</script>
</body>
</html>