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: AudioBuffer.duration
+slug: Web/API/AudioBuffer/duration
+translation_of: Web/API/AudioBuffer/duration
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p>{{domxref("AudioBuffer")}}接口的duration属性返回一个双精度数，表示缓冲区中存储的PCM数据的持续时间（以秒为单位）</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js;highlight[22]">var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
+myArrayBuffer.duration;</pre>
+
+<h3 id="值">值</h3>
+
+<p>双精度值</p>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js;highlight[22]">// Stereo
+var channels = 2;
+
+// Create an empty two second stereo buffer at the
+// sample rate of the AudioContext
+var frameCount = audioCtx.sampleRate * 2.0;
+var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
+
+button.onclick = function() {
+  // Fill the buffer with white noise;
+  // just random values between -1.0 and 1.0
+  for (var channel = 0; channel &lt; channels; channel++) {
+    // This gives us the actual ArrayBuffer that contains the data
+    var nowBuffering = myArrayBuffer.getChannelData(channel);
+    for (var i = 0; i &lt; frameCount; i++) {
+      // Math.random() is in [0; 1.0]
+      // audio needs to be in [-1.0; 1.0]
+      nowBuffering[i] = Math.random() * 2 - 1;
+    }
+  }
+
+  console.log(myArrayBuffer.duration);
+}
+</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-duration', 'duration')}}</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>14 {{property_prefix("webkit")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</td>
+   <td>15 {{property_prefix("webkit")}}<br>
+    22 (unprefixed)</td>
+   <td>6 {{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>Chrome</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>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>28 {{property_prefix("webkit")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>25</td>
+   <td>1.2</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>6 {{property_prefix("webkit")}}</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>
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