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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: AudioContext.resume()
+slug: Web/API/AudioContext/resume
+tags:
+ - AudioContext
+ - Web Audio API
+ - resume
+translation_of: Web/API/AudioContext/resume
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<p>{{ domxref("AudioContext") }} 的 <code>resume()</code> 方法,恢复之前暂停播放的音频。</p>
+
+<p>如果在{{domxref("OfflineAudioContext")}}上调用,会导致<code>INVALID_STATE_ERR错误。</code></p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+audioCtx.resume().then(function() { ... });
+</pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{jsxref("Promise")}}成功的话返回空值,返回失败是因为context已经关闭了。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的代码是 <a href="https://github.com/mdn/audiocontext-states/settings">AudioContext states demo</a> (<a href="http://mdn.github.io/audiocontext-states/">see it running live</a>)的一部分。当点击暂停/恢复按钮的时候,需要{{domxref("AudioContext.state")}}做判断:如果是运行状态,调用{{domxref("suspend()")}},如果是暂停状态,调用<code>resume()。每次点击事件成功后,按钮的文字也会随着变成对应的状态</code>。</p>
+
+<pre class="brush: js">susresBtn.onclick = function() {
+  if(audioCtx.state === 'running') {
+    audioCtx.suspend().then(function() {
+      susresBtn.textContent = 'Resume context';
+    });
+  } else if(audioCtx.state === 'suspended') {
+    audioCtx.resume().then(function() {
+      susresBtn.textContent = 'Suspend context';
+    });
+  }
+}
+</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-AudioContext-resume-Promise-void', 'close()')}}</td>
+ <td>{{Spec2('Web Audio API')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="兼容性">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(41.0)}}</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>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>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatChrome(41.0)}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/zh-CN/docs/Web/API/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+ <li><a href="/zh-CN/docs/Web/API/Web_Audio_API">Web Audio API</a></li>
+</ul>