html5事件中，deviceorientation事件，此事件是检测设备方向变化时的事件。其常用属性为alpha(x)、beta(y)、gamma(z)。
默认将手机垂直，且正面（90度）冲着自己
alpha：左右旋转
beta：前后旋转
gamma：扭转（自转）
<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>
<p id="arrow"></p>
</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)
}
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