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html5 提供的deviceorientation事件，可方便获取转角度信息。
注意：alpha,bate,gamma代表三轴，即x,y,z。
<html>
<head>
<title>DeviceOrientationEvent</title>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<script src="js/common/jquery.min.js"></script>
<script src="js/common/eventutil.js"></script>
</head>
<body>
<div id="arrow"></div>
</body>
</html>
<script>
try {
var text = "";
window.addEventListener("deviceorientation", orientationHandler, false);
function orientationHandler(event) {
text = ""
var arrow = document.getElementById("arrow");
text += "左右旋转：rotate alpha{" + Math.round(event.alpha) + "deg)<p>";
text += "前后旋转：rotate beta{" + Math.round(event.beta) + "deg)<p>";
text += "扭转设备：rotate gamma{" + Math.round(event.gamma) + "deg)<p>";
arrow.innerHTML = text;
}
}
catch (e) {
$("#arrow").html(e.message)
}
</script>