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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

defaultValue 只读特性在 AudioParam interface represents the initial value of the attributes as defined by the specific AudioNode creating the AudioParam .

句法

var defaultVal = audioParam.defaultValue;
					

值

A floating-point Number .

范例

const audioCtx = new AudioContext();
const gainNode = audioCtx.createGain();
const defaultVal = gainNode.gain.defaultValue;
console.log(defaultVal); // 1
console.log(defaultVal === gainNode.gain.value); // true
					

规范

规范	状态	注释
Web 音频 API The definition of 'defaultValue' 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
defaultValue	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： 2019 年 3 月 23 日

相关话题

1. Web 音频 API
2. AudioParam
3. 特性

   1. defaultValue
   2. maxValue
   3. minValue
   4. value
4. 方法

   1. cancelAndHoldAtTime()
   2. cancelScheduledValues()
   3. exponentialRampToValueAtTime()
   4. linearRampToValueAtTime()
   5. setTargetAtTime()
   6. setValueAtTime()
   7. setValueCurveAtTime()
5. 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. AudioProcessingEvent
   11. AudioScheduledSourceNode
   12. AudioWorklet
   13. AudioWorkletGlobalScope
   14. AudioWorkletNode
   15. AudioWorkletProcessor
   16. BaseAudioContext
   17. BiquadFilterNode
   18. ChannelMergerNode
   19. ChannelSplitterNode
   20. ConstantSourceNode
   21. ConvolverNode
   22. DelayNode
   23. DynamicsCompressorNode
   24. GainNode
   25. IIRFilterNode
   26. MediaElementAudioSourceNode
   27. MediaStreamAudioDestinationNode
   28. MediaStreamAudioSourceNode
   29. OfflineAudioCompletionEvent
   30. OfflineAudioContext
   31. OscillatorNode
   32. PannerNode
   33. PeriodicWave
   34. StereoPannerNode
   35. WaveShaperNode