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+---
+title: AudioNode.connect(AudioParam)
+slug: Web/API/AudioNode/connect(AudioParam)
+translation_of: Web/API/AudioNode/connect(AudioParam)
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p>允许我们将当前节点的一个输出连接到音频参数的一个输入，并允许通过音频信号控制参数。<br>
+ 使AudioNode输出连接到多个AudioParam，并将多个AudioNode输出连接到单个 AudioParam，同时多次调用connect()。因此支持Fan-in and fan-out。<br>
+  AudioParam可以从连接到它的任何AudioNode输出获取渲染的音频数据，并通过下混合将其转换为单声道（如果本身不是单声道的话）。然后，它将其他这样的输出和固定参数混合（ AudioParam的值通常没有任何连接），包括为参数调度的任何时间的变化。<br>
+ 因此，可以通过将AudioParam的值设置为中心频率来选择AudioParam将要更改的范围，并使用音频源和AudioParam之间的GainNode来调整AudioParam更改的范围。</p>
+</div>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="brush: js;highlight[11]">var lfo = audioCtx.createOscillator();
+lfo.frequency.value = 2.0; // Hz, two times per second
+
+var lfoGain = audioCtx.createGain();
+lfoGain.gain.value = 0.5;
+
+// this is the parameter that is going to be modulated
+var gain = audioCtx.createGain();
+gain.gain.value = 0.5;
+
+// Oscillators go from -1 to 1
+// Make it go from -0.5 to +0.5 by connecting it to a GainNode with a gain value of 0.5
+lfo.connect(lfoGain);
+
+// because the value of the gain.gain AudioParam is originaly 0.5, the value is added, and it will go from 0.0 to 1.0
+lfoGain.connect(gain.gain);
+
+lfo.connect(gain.gain);</pre>
+
+<div class="note">
+<p><strong>Note</strong>: There can only be one connection between an output from one specific <code>AudioNode</code> and an {{ domxref("AudioParam") }}. Multiple connections to the same termini are equivalent to a single such connection (the duplicates are ignored).</p>
+</div>
+
+<h3 id="Description" name="Description">Returns</h3>
+
+<p>Void.</p>
+
+<h2 id="Examples" name="Examples">Example</h2>
+
+<p>In this example, we will be altering the gain value of a {{domxref("GainNode")}} using an {{domxref("OscillatorNode")}} with a slow frequency value. This technique is know as an <em>LFO</em>-controlled parameter.</p>
+
+<pre class="brush: js;highlight[8,9]">var AudioContext = window.AudioContext || window.webkitAudioContext;
+
+var audioCtx = new AudioContext();
+
+// create an normal oscillator to make sound
+var oscillator = audioCtx.createOscillator();
+
+// create a second oscillator that will be used as an LFO (Low-frequency
+// oscillator), and will control a parameter
+var lfo = audioCtx.createOscillator();
+
+// set the frequency of the second oscillator to a low number
+lfo.frequency.value = 2.0; // 2Hz: two oscillations par second
+
+// create a gain whose gain AudioParam will be controlled by the LFO
+var gain = audioCtx.createGain();
+
+// connect the LFO to the gain AudioParam. This means the value of the LFO
+// will not produce any audio, but will change the value of the gain instead
+lfo.connect(gain.gain);
+
+// connect the oscillator that will produce audio to the gain
+oscillator.connect(gain);
+
+// connect the gain to the destination so we hear sound
+gain.connect(audioCtx.destination);
+
+// start the oscillator that will produce audio
+oscillator.start();
+
+// start the oscillator that will modify the gain value
+lfo.start();</pre>
+
+<h2 id="Parameters" name="Parameters">Parameters</h2>
+
+<dl>
+ <dt>Destination</dt>
+ <dd>The {{ domxref("AudioParam") }} you are connecting to.</dd>
+ <dt>Output (optional)</dt>
+ <dd>An index describing which output of the current <code>AudioNode</code> you want to connect to the {{ domxref("AudioParam") }}. The index numbers are defined according to the number of output channels (see <a href="/en-US/docs/Web/API/Web_Audio_API/Basic_concepts_behind_Web_Audio_API#Audio_channels">Audio channels</a>.)  If this parameter is out-of-bound, an <code>INDEX_SIZE_ERR</code> exception is thrown.</dd>
+</dl>
+
+<h2 id="Specifications">Specifications</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-AudioNode-connect-void-AudioParam-destination-unsigned-long-output', 'connect(AudioParam)')}}</td>
+   <td>{{Spec2('Web Audio API')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</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><code>connect</code><code>(AudioParam)</code></td>
+   <td>{{CompatVersionUnknown}} {{property_prefix("webkit")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</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 (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td><code>connect</code><code>(AudioParam)</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</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>