---
title: DeviceOrientationEvent.beta
slug: Web/API/DeviceOrientationEvent/beta
translation_of: Web/API/DeviceOrientationEvent/beta
---
<p>{{ ApiRef("Device Orientation Events") }}</p>

<p>返回设备旋转时X轴的值. 即: 角度的数值, 范围介于-180 ------ 180之间  表示设备正在向前或向后倾斜.更多信息见  <a href="/en/DOM/Orientation_and_motion_data_explained" title="Orientation and motion data explained">方向和运动数据详解</a></p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">var beta = <em>instanceOfDeviceOrientationEvent</em>.beta;</pre>

<h2 id="规范">规范</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="浏览器的兼容性">浏览器的兼容性</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>7.0</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>6 [1]</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Edge</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>3.0</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>6 [1]</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>4.2</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] Firefox 3.6, 4, and 5 supported <a href="/en-US/DOM/MozOrientation">mozOrientation </a>instead of the standard <code>DeviceOrientationEvent</code> interface</p>

<h2 id="另请参阅">另请参阅</h2>

<ul>
 <li>{{ domxref("DeviceOrientationEvent") }}</li>
 <li><a href="/en/Detecting_device_orientation" title="Detecting device orientation">Detecting device orientation</a></li>
 <li><a href="/en/DOM/Orientation_and_motion_data_explained" title="Orientation and motion data explained">Orientation and motion data explained</a></li>
 <li>{{ domxref("window.ondeviceorientation") }}</li>
 <li>{{ event("deviceorientation") }}</li>
</ul>