在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

type 特性为 OscillatorNode interface specifies what shape of waveform the oscillator will output. There are several common waveforms available, as well as an option to specify a custom waveform shape. The shape of the waveform will affect the tone that is produced.

句法

OscillatorNode.type = type;
					

值

A DOMString specifying the shape of oscillator wave. The different available values are:

sine

A sine wave . This is the default value.

square

A square wave 采用 duty cycle of 0.5; that is, the signal is "high" for half of each period.

sawtooth

A sawtooth wave .

triangle

A triangle wave .

custom

A custom waveform. You never set type to custom manually; instead, use the setPeriodicWave() method to provide the data representing the waveform. Doing so automatically sets the type to custom .

异常

InvalidStateError

值 custom was specified. To set a custom waveform, just call setPeriodicWave() . Doing so automatically sets the type for you.

范例

The following example shows basic usage of an AudioContext to create an oscillator node. For an applied example, check out our Violent Theremin demo ( see app.js for relevant code).

// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
// create Oscillator node
var oscillator = audioCtx.createOscillator();
oscillator.type = 'square';
oscillator.frequency.setValueAtTime(440, audioCtx.currentTime); // value in hertz
oscillator.start();
					

规范

规范	状态	注释
Web 音频 API The definition of 'type' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
type	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS Yes	Samsung Internet Android 1.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• 使用 Web 音频 API

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. Web 音频 API
2. OscillatorNode
3. 构造函数

   1. OscillatorNode()
4. 特性

   1. detune
   2. frequency
   3. onended
   4. type
5. 方法

   1. setPeriodicWave()
   2. start()
   3. stop()
6. 继承：

   1. AudioNode
   2. EventTarget
7. Related pages for Web Audio API

   1. AnalyserNode
   2. AudioBuffer
   3. AudioBufferSourceNode
   4. AudioContext
   5. AudioContextOptions
   6. AudioDestinationNode
   7. AudioListener
   8. AudioNode
   9. AudioNodeOptions
   10. AudioParam
   11. AudioProcessingEvent
   12. AudioScheduledSourceNode
   13. AudioWorklet
   14. AudioWorkletGlobalScope
   15. AudioWorkletNode
   16. AudioWorkletProcessor
   17. BaseAudioContext
   18. BiquadFilterNode
   19. ChannelMergerNode
   20. ChannelSplitterNode
   21. ConstantSourceNode
   22. ConvolverNode
   23. DelayNode
   24. DynamicsCompressorNode
   25. GainNode
   26. IIRFilterNode
   27. MediaElementAudioSourceNode
   28. MediaStreamAudioDestinationNode
   29. MediaStreamAudioSourceNode
   30. OfflineAudioCompletionEvent
   31. OfflineAudioContext
   32. PannerNode
   33. PeriodicWave
   34. StereoPannerNode
   35. WaveShaperNode