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---
title: DeviceMotionEvent
slug: Web/API/DeviceMotionEvent
translation_of: Web/API/DeviceMotionEvent
---
<p>{{apiref("Device Orientation Events")}}{{SeeCompatTable}}</p>
<h2 id="概要">概要</h2>
<p><code>DeviceMotionEvent</code> 提供了網頁開發者關於裝置位置及旋轉方向改變時的速度資訊。</p>
<div class="warning">
<p><strong>Warning:</strong> Currently, Firefox and Chrome does not handle the coordinates the same way. Take care about this while using them.</p>
</div>
<h2 id="屬性">屬性</h2>
<dl>
<dt>{{domxref("DeviceMotionEvent.acceleration")}} {{readonlyinline}}</dt>
<dd>An object giving the acceleration of the device on the three axis X, Y and Z. Acceleration is expressed in <a href="https://en.wikipedia.org/wiki/Meter_per_second_squared" title="https://en.wikipedia.org/wiki/Meter_per_second_squared">m/s<sup>2</sup></a>.</dd>
<dt>{{domxref("DeviceMotionEvent.accelerationIncludingGravity")}} {{readonlyinline}}</dt>
<dd>An object giving the acceleration of the device on the three axis X, Y and Z with the effect of gravity. Acceleration is expressed in <a href="https://en.wikipedia.org/wiki/Meter_per_second_squared" title="https://en.wikipedia.org/wiki/Meter_per_second_squared">m/s<sup>2</sup></a>.</dd>
<dt>{{domxref("DeviceMotionEvent.rotationRate")}} {{readonlyinline}}</dt>
<dd>An object giving the rate of change of the device's orientation on the three orientation axis alpha, beta and gamma. Rotation rate is express in degrees per seconds.</dd>
<dt>{{domxref("DeviceMotionEvent.interval")}} {{readonlyinline}}</dt>
<dd>A number representing the interval of time, in milliseconds, at which data is obtained from the device.</dd>
</dl>
<h2 id="範例">範例</h2>
<pre class="brush: js">window.addEventListener('devicemotion', function(event) {
console.log(event.acceleration.x + ' m/s2');
});</pre>
<h2 id="規範">規範</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('Device Orientation')}}</td>
<td>{{Spec2('Device Orientation')}}</td>
<td>Initial specification.</td>
</tr>
</tbody>
</table>
<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
{{Compat("api.DeviceMotionEvent")}}
<h2 id="參見">參見</h2>
<ul>
<li>{{ event("deviceorientation") }}</li>
<li>{{ domxref("DeviceMotionEvent") }}</li>
<li>{{ event("devicemotion") }}</li>
<li><a href="/en-US/docs/WebAPI/Detecting_device_orientation" title="/en-US/docs/WebAPI/Detecting_device_orientation">Detecting device orientation</a></li>
<li><a href="https://developer.mozilla.org/en/DOM/Orientation_and_motion_data_explained" title="Orientation and motion data explained">Orientation and motion data explained</a></li>
</ul>
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