---
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>