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+---
+title: AudioBuffer.copyFromChannel()
+slug: Web/API/AudioBuffer/copyFromChannel
+translation_of: Web/API/AudioBuffer/copyFromChannel
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p><span class="seoSummary">{{ domxref("AudioBuffer") }}接口的copyFromChannel方法将样本从AudioBuffer的指定通道复制到目标数组中</span></p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>myArrayBuffer</em>.copyFromChannel(<em>destination</em>,<em>channelNumber</em>,<em>startInChannel</em>);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><em>destination</em></dt>
+ <dd>将通道数据复制到的{{domxref("Float32Array")}}</dd>
+ <dt><em>channelNumber</em></dt>
+ <dd>当前AudioBuffer的通道号，用于复制通道数据。键入channelNumber大于或等于{{domxref("AudioBuffer.numberOfChannels")}}，将会抛出<code>INDEX_SIZE_ERR</code> 的错误</dd>
+ <dt><em>startInChannel</em> {{optional_inline}}</dt>
+ <dd>用于复制数据的可选偏移量。假如<em>startInChannel比</em>{{domxref("AudioBuffer.length")}}大，将会抛出<code>INDEX_SIZE_ERR</code> 的错误</dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
+var anotherArray = new Float32Array;
+myArrayBuffer.copyFromChannel(anotherArray,1,0);
+</pre>
+
+<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-AudioBuffer-copyFromChannel-void-Float32Array-destination-long-channelNumber-unsigned-long-startInChannel', 'copyFromChannel')}}</td>
+   <td>{{Spec2('Web Audio API')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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>{{CompatChrome(14.0)}} {{property_prefix("webkit")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop(27)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>15 {{property_prefix("webkit")}}<br>
+    22 (unprefixed)</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td>Unprefixed</td>
+   <td>{{CompatChrome(43.0)}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile(27)}}</td>
+   <td>1.2</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(28.0)}} {{property_prefix("webkit")}}</td>
+  </tr>
+  <tr>
+   <td>Unprefixed</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(43.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+</ul>