From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: AudioContext.close()
+slug: Web/API/AudioContext/close
+translation_of: Web/API/AudioContext/close
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<p>{{ domxref("AudioContext") }}的<code>close()</code>方法可以关闭audio context，同时释放占用的所有系统资源。</p>
+
+<p>关闭的context不能用来创建新节点，但可以解码音频数据，创建buffer等等</p>
+
+<p>该函数不会自动释放所有用<code>AudioContext创建的对象</code>，除非其他引用也都已经解除了。但是，它会强制释放所有可能阻止其它<code style="font-style: normal;">AudioContexts被创建或使用</code>的系统音频资源。挂起audio context中音频时间的进度，并停止对音频数据的处理。<span title="The returned 'Promise' resolves when all AudioContext-creation-blocking resources have been released.">所有的<span style="font-family: courier,andale mono,monospace;">AudioContext创建/阻塞资源都被释放后，</span>返回的{{jsxref("Promise")}}才会被释放。</span>如果在一个{{domxref("OfflineAudioContext")}}上调用该方法，则会抛出<code>INVALID_STATE_ERR</code> 异常。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+audioCtx.close().then(function() { ... });
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个 resolve  void值得 {{jsxref("Promise")}}。 </p>
+
+<h2 id="例子">例子</h2>
+
+<p>下面这段代码是<a href="https://github.com/mdn/audiocontext-states/settings">AudioContext states demo</a> (<a href="http://mdn.github.io/audiocontext-states/">直接运行</a>)中的，点击停止按钮调用<code>close()</code>。promise释放后，回到初始状态。</p>
+
+<pre class="brush: js">stopBtn.onclick = function() {
+  audioCtx.close().then(function() {
+    startBtn.removeAttribute('disabled');
+    susresBtn.setAttribute('disabled','disabled');
+    stopBtn.setAttribute('disabled','disabled');
+  });
+}
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Web Audio API', '#widl-AudioContext-close-Promise-void', 'close()')}}</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>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(43.0)}}</td>
+   <td>{{CompatGeckoDesktop(40.0)}}</td>
+   <td>{{CompatNo}}</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>Android Webview</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>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+ <li><a href="/en-US/docs/Web/API/Web_Audio_API">Web Audio API</a></li>
+</ul>
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