html5 获取 陀螺仪，重力感应(转发)

DeviceOrientationEvent是获取方向，得到device静止时的绝对值；
    DeviceMotionEvent是获取移动速度，得到device移动时相对之前某个时间的差值比

设备定位API，该API允许你收集设备的方向和移动信息。此外，该API只在具备陀螺仪功能的设备上使用。

<html>

<head>
<title>DeviceOrientationEvent</title>
<meta charset="UTF-8" />
</head>

<body>
<p>左右：<span id="alpha">0</span>
</p>
<p>前后：<span id="beta">0</span>
</p>
<p>扭转：<span id="gamma">0</span>
</p>
<p>指北针指向：<span id="heading">0</span>度</p>
<p>指北针精度：<span id="accuracy">0</span>度</p>
<hr />
<p>x轴加速度：<span id="x">0</span>米每二次方秒</p>
<p>y轴加速度：<span id="y">0</span>米每二次方秒</p>
<p>z轴加速度：<span id="z">0</span>米每二次方秒</p>
<hr />
<p>x轴加速度(考虑重力加速度)：<span id="xg">0</span>米每二次方秒</p>
<p>y轴加速度(考虑重力加速度)：<span id="yg">0</span>米每二次方秒</p>
<p>z轴加速度(考虑重力加速度)：<span id="zg">0</span>米每二次方秒</p>
<hr />
<p>左右旋转速度：<span id="Ralpha">0</span>度每秒</p>
<p>前后旋转速度：<span id="Rbeta">0</span>度每秒</p>
<p>扭转速度：<span id="Rgamma">0</span>度每秒</p>
<hr />
<p>上次收到通知的间隔：<span id="interval">0</span>毫秒</p>

<script type="text/javascript">
function orientationHandler(event) {
document.getElementById("alpha").innerHTML = event.alpha;
document.getElementById("beta").innerHTML = event.beta;
document.getElementById("gamma").innerHTML = event.gamma;
document.getElementById("heading").innerHTML = event.webkitCompassHeading;
document.getElementById("accuracy").innerHTML = event.webkitCompassAccuracy;

}

function motionHandler(event) {
document.getElementById("interval").innerHTML = event.interval;
var acc = event.acceleration;
document.getElementById("x").innerHTML = acc.x;
document.getElementById("y").innerHTML = acc.y;
document.getElementById("z").innerHTML = acc.z;
var accGravity = event.accelerationIncludingGravity;
document.getElementById("xg").innerHTML = accGravity.x;
document.getElementById("yg").innerHTML = accGravity.y;
document.getElementById("zg").innerHTML = accGravity.z;
var rotationRate = event.rotationRate;
document.getElementById("Ralpha").innerHTML = rotationRate.alpha;
document.getElementById("Rbeta").innerHTML = rotationRate.beta;
document.getElementById("Rgamma").innerHTML = rotationRate.gamma;
}

if (window.DeviceMotionEvent) {
window.addEventListener("devicemotion", motionHandler, false);
} else {
document.body.innerHTML = "What user agent u r using???";
}

if (window.DeviceOrientationEvent) {
window.addEventListener("deviceorientation", orientationHandler, false);
} else {
document.body.innerHTML = "What user agent u r using???";
};
</script>
</body>

</html>