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+---
+title: AudioContext.createMediaElementSource()
+slug: Web/API/AudioContext/createMediaElementSource
+translation_of: Web/API/AudioContext/createMediaElementSource
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p>{{ domxref("AudioContext") }} 接口的 <code>createMediaElementSource() 方法用于创建一个新的 </code>{{ domxref("MediaElementAudioSourceNode") }} 对象,输入某个存在的 HTML {{htmlelement("audio")}} or {{htmlelement("video")}} 元素, 对应的音频即可被播放或者修改.</p>
+</div>
+
+<p>为寻求更多关于媒体元素音频源节点的具体信息,请查阅 {{ domxref("MediaElementAudioSourceNode") }} 参考页.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+var source = audioCtx.createMediaElementSource(myMediaElement);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>myMediaElement</code></dt>
+ <dd>某个被期待被录入音频处理图修改的 {{domxref("HTMLMediaElement")}} 对象.</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个 {{domxref("MediaElementAudioSourceNode")}} 对象.</p>
+
+<h2 id="示例">示例</h2>
+
+<p>该示例由 {{htmlelement("audio") }} 元素,通过使用 <code>createMediaElementSource() 方法,</code>创建了一个音源,将其通过 {{ domxref("GainNode") }} 节点,输出到{{ domxref("AudioDestinationNode") }} 节点以播放.当鼠标指针移动时, <code>updatePage()</code> 函数被调用,该函数计算当前鼠标Y坐标与页面高度的比值, 改变 {{ domxref("GainNode") }} 节点的值以调整音量.您就可以通过鼠标上下移动而改变音乐的音量了.</p>
+
+<div class="note">
+<p><strong>Note</strong>: 您也可以 <a href="http://mdn.github.io/webaudio-examples/media-source-buffer/">浏览该示例的在线演示</a>, 或者 <a href="https://github.com/mdn/webaudio-examples/tree/master/media-source-buffer">浏览源代码</a>.</p>
+</div>
+
+<pre class="brush: js">var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+var myAudio = document.querySelector('audio');
+var pre = document.querySelector('pre');
+var myScript = document.querySelector('script');
+
+pre.innerHTML = myScript.innerHTML;
+
+// Create a MediaElementAudioSourceNode
+// Feed the HTMLMediaElement into it
+var source = audioCtx.createMediaElementSource(myAudio);
+
+// Create a gain node
+var gainNode = audioCtx.createGain();
+
+// Create variables to store mouse pointer Y coordinate
+// and HEIGHT of screen
+var CurY;
+var HEIGHT = window.innerHeight;
+
+// Get new mouse pointer coordinates when mouse is moved
+// then set new gain value
+
+document.onmousemove = updatePage;
+
+function updatePage(e) {
+    CurY = (window.Event) ? e.pageY : event.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);
+
+    gainNode.gain.value = CurY/HEIGHT;
+}
+
+
+// connect the AudioBufferSourceNode to the gainNode
+// and the gainNode to the destination, so we can play the
+// music and adjust the volume using the mouse cursor
+source.connect(gainNode);
+gainNode.connect(audioCtx.destination);</pre>
+
+<div class="note">
+<p><strong>Note</strong>: 作为调用<code> createMediaElementSource() </code>的结果,{{domxref("HTMLMediaElement")}} 的播放将会由AudioContext的音频处理图接管.所以对媒体进行播放/暂停等操作仍可通过media API与播放器面板来进行.</p>
+</div>
+
+<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-createMediaElementSource-MediaElementAudioSourceNode-HTMLMediaElement-mediaElement', 'createMediaElementSource()')}}</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>{{CompatChrome(10.0)}}{{property_prefix("webkit")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop(25.0)}} </td>
+   <td>{{CompatNo}}</td>
+   <td>15.0{{property_prefix("webkit")}}<br>
+    22</td>
+   <td>
+    <p>6.0{{property_prefix("webkit")}}</p>
+
+    <p>- buggy! not working -</p>
+   </td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</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>{{CompatVersionUnknown}}</td>
+   <td>26.0</td>
+   <td>1.2</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>
+    <p>{{CompatUnknown}}</p>
+
+    <p>- buggy! not working -</p>
+   </td>
+   <td>33.0</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+</ul>