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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

start() method on AudioScheduledSourceNode schedules a sound to begin playback at the specified time. If no time is specified, then the sound begins playing immediately.

句法

AudioScheduledSourceNode.start([when [, offset [, duration]]]);
					

参数

当 可选

The time, in seconds, at which the sound should begin to play. This value is specified in the same time coordinate system as the AudioContext is using for its currentTime attribute. A value of 0 (or omitting the 当 parameter entirely) causes the sound to start playback immediately.

offset 可选

A floating-point number indicating the offset, in seconds, into the audio buffer where playback should begin. If 0 is passed then the playback will start from the beginning.

duration 可选

A floating-point number indicating the duration, in seconds, to be played. If no value is passed then the duration will be equal to the length of the audio buffer minus the offset value

返回值

undefined

异常

InvalidStateNode

The node has already been started. This error occurs even if the node is no longer running because of a prior call to stop() .

RangeError

The value specified for 当 为负。

范例

This example demonstrates how to create an OscillatorNode which is scheduled to start playing in 2 seconds and stop playing 1 second after that. The times are calculated by adding the desired number of seconds to the context's current time stamp returned by AudioContext.currentTime .

context = new AudioContext();
osc = context.createOscillator();
osc.connect(context.destination);
/* Schedule the start and stop times for the oscillator */
osc.start(context.currentTime + 2);
osc.stop(context.currentTime + 3);
					

规范

规范	状态	注释
Web 音频 API The definition of 'start()' 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
start	Chrome 14	Edge ≤79	Firefox 53	IE 不支持 No	Opera 15	Safari ?	WebView Android Yes	Chrome Android 18	Firefox Android 25	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

另请参阅

• 使用 Web 音频 API
• stop()
• AudioScheduledSourceNode
• AudioBufferSourceNode
• ConstantSourceNode
• OscillatorNode

元数据

• 最后修改： Feb 17, 2020

相关话题

1. Web 音频 API
2. AudioScheduledSourceNode
3. 特性

   1. onended
4. 方法

   1. start()
   2. stop()
5. 事件

   1. ended
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. 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