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

<p><span class="seoSummary"> <strong><code>createConstantSource()</code></strong> 是 {{domxref("BaseAudioContext")}} 接口的一个方法， 用于生成一个 {{domxref("ConstantSourceNode")}} 对象, 该对象是一个输出单信道（one-channel）音频信号的音频源，这些音频信号都拥有一个恒定的样本值。</span></p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">var constantSourceNode = AudioContext.createConstantSource()</pre>

<h3 id="Parameters">Parameters</h3>

<p>None.</p>

<h3 id="Returns">Returns</h3>

<p>A {{domxref('ConstantSourceNode')}} instance.</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','#dom-baseaudiocontext-createconstantsource','createConstantSource()')}}</td>
   <td>{{Spec2('Web Audio API')}}</td>
   <td>Initial definition.</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>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatChrome(56.0)}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatOpera(43)}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
  <tr>
   <td>Implemented on <code>AudioContext</code></td>
   <td>{{CompatChrome(10.0)}}{{property_prefix("webkit")}}</td>
   <td>{{CompatVersionUnknown}}</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>Android Webview</th>
   <th>Firefox Mobile (Gecko)</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>{{CompatNo}}</td>
   <td>{{CompatChrome(56.0)}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatOperaMobile(43)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatChrome(56.0)}}</td>
  </tr>
  <tr>
   <td>Implemented on <code>AudioContext</code></td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>26.0</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>33.0</td>
  </tr>
 </tbody>
</table>
</div>