---
title: DeviceMotionEvent.rotationRate
slug: Web/API/DeviceMotionEvent/rotationRate
tags:
  - API
  - DOM
  - Firefox OS
  - 传感器
  - 运动传感器
  - 需要示例
translation_of: Web/API/DeviceMotionEvent/rotationRate
---
<p>{{ ApiRef("Device Orientation Events") }}</p>

<p><span class="short_text" id="result_box" lang="zh-CN"><span>返回设备围绕其每个轴（x、y、z）旋转的速率（单位：度/秒）。</span></span></p>

<div class="note"><strong>注意</strong>: 如果设备无法提供此信息，则为null</div>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">var rates = <em>instanceOfDeviceMotionEvent</em>.rotationRate;
</pre>

<h2 id="值">值</h2>

<p><span class="short_text" id="result_box" lang="zh-CN"><span>rotationRates属性是一个只读对象，用于描述设备围绕其每个轴的旋转速率：</span></span></p>

<dl>
 <dt><code>alpha</code></dt>
 <dd><span id="result_box" lang="zh-CN"><span>设备绕其Z轴旋转的速率（</span><span>即绕垂直于屏幕的线旋转）</span></span></dd>
 <dt><code>beta</code></dt>
 <dd><span class="short_text" id="result_box" lang="zh-CN"><span>设备绕其X轴旋转的速率（</span><span>即从前到后旋转）</span></span></dd>
 <dt><code>gamma</code></dt>
 <dd><span class="short_text" id="result_box" lang="zh-CN"><span>设备绕其Y轴旋转的速率（</span><span>即从一侧到另一侧）</span></span></dd>
</dl>

<h2 id="说明">说明</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="浏览器兼容性">浏览器兼容性</h2>

{{Compat("api.DeviceMotionEvent.rotationRate")}}

<h2 id="推荐阅读">推荐阅读</h2>

<ul>
 <li>{{ domxref("DeviceMotionEvent") }}</li>
 <li>{{ event("devicemotion") }}</li>
 <li>{{ domxref("window.ondevicemotion") }}</li>
 <li>{{ event("deviceorientation") }}</li>
 <li>{{ domxref("DeviceOrientationEvent") }}</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>