<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script>
var orientation=0;
function screenOrientationEvent(){
if(orientation == 0)
{
document.getElementById("change").value="竖";
$("body").css({
‘transform‘:‘rotate(90deg)‘,
‘-webkit-transform‘:‘rotate(90deg)‘,
‘-moz-transform‘:‘rotate(90deg)‘
});
}
else
{
document.getElementById("change").value="横";
$("body").css({
‘transform‘:‘rotate(0deg)‘,
‘-webkit-transform‘:‘rotate(0deg)‘,
‘-moz-transform‘:‘rotate(0deg)‘
});
}
}
var innerWidthTmp = window.innerWidth;
//横竖屏事件监听方法
function screenOrientationListener(){
try{
var iw = window.innerWidth;
//屏幕方向改变处理
if(iw != innerWidthTmp){
if(iw>window.innerHeight)
{
orientation = 90;
}
else
{
orientation = 0;
}
//调用转屏事件
screenOrientationEvent();
innerWidthTmp = iw;
}
}
catch(e){alert(e);};
//间隔固定事件检查是否转屏，默认500毫秒
setTimeout("screenOrientationListener()",500);
}
//启动横竖屏事件监听
screenOrientationListener();
</script>
<body onload="screenOrientationEvent()">
<input id="change" type="text" value=""/>
</body>
</html>
原文：http://www.cnblogs.com/moustache/p/5497132.html