---
title: AudioDestinationNode.maxChannelCount
slug: Web/API/AudioDestinationNode/maxChannelCount
translation_of: Web/API/AudioDestinationNode/maxChannelCount
---
<p>{{ APIRef("Web Audio API") }}</p>

<div>
<p>{{ domxref("AudioDestinationNode") }} 接口的<code>maxchannelCount属性是</code>一个表示物理设备能处理最大通道数的无符号长整型数。</p>

<p> {{domxref("AudioNode.channelCount")}} 属性值只能在 0和这个值 (两端包含)之间。如果 <code>maxChannelCount</code>为 <code>0</code>,例如在 {{domxref("OfflineAudioContext")}}, 表示音频通道不能被改变。</p>
</div>

<h2 id="语法">语法</h2>

<pre class="brush: js">var audioCtx = new AudioContext();
var myDestination = audioCtx.destination;
myDestination.maxChannelCount = 2;
</pre>

<h3 id="值">值</h3>

<p>一个无符号长整型数</p>

<h2 id="例子">例子</h2>

<p>下面假设了一个简单的音频环境，设置其中 <code>AudioDestinationNode的</code><code>maxChannelCount值为</code> 2:</p>

<pre class="brush: js">var audioCtx = new AudioContext();
var source = audioCtx.createMediaElementSource(myMediaElement);
source.connect(gainNode);
audioCtx.destination.maxChannelCount = 2;
gainNode.connect(audioCtx.destination);</pre>

<p>为看到一个更完整的实施，请访问我们的 MDN Web Audio 例子,如 <a href="http://mdn.github.io/voice-change-o-matic/">Voice-change-o-matic</a> 或者 <a href="http://mdn.github.io/violent-theremin/">Violent Theremin</a>.</p>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('Web Audio API', '#widl-AudioDestinationNode-maxChannelCount', 'maxChannelCount')}}</td>
   <td>{{Spec2('Web Audio API')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容">浏览器兼容</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatChrome(10.0)}}{{property_prefix("webkit")}}</td>
   <td>{{CompatGeckoDesktop(25.0)}} </td>
   <td>{{CompatNo}}</td>
   <td>15.0{{property_prefix("webkit")}}<br>
    22 (unprefixed)</td>
   <td>6.0{{property_prefix("webkit")}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>26.0</td>
   <td>1.2</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>33.0</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="其他">其他</h2>

<ul>
 <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
</ul>