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+---
+title: GainNode.gain
+slug: Web/API/GainNode/gain
+translation_of: Web/API/GainNode/gain
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p>{{ domxref("GainNode") }} 接口的gain属性是一个<a href="/en-US/docs/Web/API/AudioParam#a-rate">a-rate</a> {{domxref("AudioParam")}} ,表示可利用的增益量.</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+var gainNode = audioCtx.createGain();
+gainNode.gain.value = 0.5;
+</pre>
+
+<h3 id="值">值</h3>
+
+<p>An {{domxref("AudioParam")}}.</p>
+
+<div class="note">
+<p><strong>Note</strong>: Though the <code>AudioParam</code> returned is read-only, the value it represents is not.</p>
+</div>
+
+<h2 id="Example">Example</h2>
+
+<p>{{page("/en-US/docs/Web/API/AudioContext.createGain","Example")}}</p>
+
+<h2 id="Specifications">Specifications</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-GainNode-gain', 'gain')}}</td>
+   <td>{{Spec2('Web Audio API')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</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(10.0)}}{{property_prefix("webkit")}}</td>
+   <td>{{CompatVersionUnknown}}</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>Edge</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>{{CompatVersionUnknown}}</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="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+</ul>
diff --git a/files/zh-cn/web/api/gainnode/index.html b/files/zh-cn/web/api/gainnode/index.html
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+---
+title: GainNode
+slug: Web/API/GainNode
+tags:
+  - GainNode
+  - HTML5 音频
+  - Web Audio API
+  - de-zippering
+translation_of: Web/API/GainNode
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p><strong><code>GainNode</code></strong><strong> </strong>接口表示音量的变化。它是一个{{domxref("AudioNode")}}音频处理模块，在输出前使用给定<em>增益</em>应用到输入。一个 <code>GainNode</code><strong> </strong>总是只有一个输入和一个输出，两者拥有同样数量的声道。</p>
+
+<p>增益是一个无单位的值，会对所有输入声道的音频进行相应的增加。如果进行了修改，则会立即应用新增益，从而在结果音频中产生奇怪的“咔嗒”声。<font><font>为了防止这种情况发生，请不要直接更改值，而应在</font></font>{{domxref("AudioParam")}}接口<font><font>上使用指数插值方法</font><font>。</font></font></p>
+</div>
+
+<p><img alt="The GainNode is increasing the gain of the output." src="https://mdn.mozillademos.org/files/5085/WebAudioGainNode.png" style="height: 116px; width: 774px;"></p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Number of inputs</th>
+   <td><code>1</code></td>
+  </tr>
+  <tr>
+   <th scope="row">Number of outputs</th>
+   <td><code>1</code></td>
+  </tr>
+  <tr>
+   <th scope="row">Channel count mode</th>
+   <td><code>"max"</code></td>
+  </tr>
+  <tr>
+   <th scope="row">Channel count</th>
+   <td><code>2</code> (not used in the default count mode)</td>
+  </tr>
+  <tr>
+   <th scope="row">Channel interpretation</th>
+   <td><code>"speakers"</code></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="构造函数">构造函数</h2>
+
+
+
+<dl>
+ <dt>{{domxref("GainNode.GainNode", "GainNode()")}}</dt>
+ <dd><font><font>创建</font></font><code>GainNode</code><font><font>对象</font><font>的新实例</font><font>。</font><font>不应手动创建增益节点；而应该</font><font>使用</font></font>{{domxref("AudioContext.createGain()")}}方法。</dd>
+</dl>
+
+<h2 id="属性">属性</h2>
+
+<p><em><font><font>从其父类继承属性</font></font>{{domxref("AudioNode")}}。</em></p>
+
+<dl>
+ <dt>{{domxref("GainNode.gain")}} {{readonlyinline}}</dt>
+</dl>
+
+<p><font><font>是一个</font></font><font><font><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/AudioParam#a-rate">a-rate</a></font></font>{{domxref("AudioParam")}}表示应用的增益量。<font><font>必须设置</font></font>{{domxref("AudioParam.value")}}或者使用<code>AudioParam</code>的方法<font><font>改变增益效果。</font></font></p>
+
+<h2 id="方法">方法</h2>
+
+<p><em>无指定方法；所有方法继承自父类{{domxref("AudioNode")}}</em>.</p>
+
+<h2 id="示例">示例</h2>
+
+<p>{{page("/zh-CN/docs/Web/API/AudioContext.createGain","Example")}}</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', '#the-gainnode-interface', 'GainNode')}}</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>
+
+<p>{{Compat("api.GainNode")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/zh-CN/docs/Web_Audio_API/Using_Web_Audio_API">使用Web音频API</a></li>
+</ul>