Audio defaultPlaybackRateProperty

Audio 对象参考手册Audio Object

Example

Set the audio to play at a low speed by default:

document.getElementById("myAudio").defaultPlaybackRate = 0.5;

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Definition and Usage

The defaultPlaybackRate property sets or returns the default playback speed of the audio.

Setting this property only changes the default playback speed, not the current one. To change the current playback speed, use theplaybackRateproperty.

Browser Support

Internet ExplorerFirefoxOperaGoogle ChromeSafari

All major browsers support the defaultPlaybackRate property, except Safari.

Note:Internet Explorer 8 and earlier IE versions do not support the defaultPlaybackRate property.

Syntax

Return the defaultPlaybackRate property:

audioObject.defaultPlaybackRate

Set the defaultPlaybackRate property:

audioObject.defaultPlaybackRate=number

Property Values

Value Description
playbackspeed

Indicates the default playback speed of the audio/video.

Example values:

  • 1.0 Normal speed
  • 0.5 Half speed (slower)
  • 2.0 Double speed (faster)
  • -1.0 Backward, normal speed
  • -0.5 Backward, half speed

Technical Details

Return value: A number value, the default playback speed
Default value: 1.0

More Examples

Example

Set the audio to fast playback by default:

document.getElementById("myAudio").defaultPlaybackRate = 2;

Try it Yourself »

Audio 对象参考手册Audio Object Other Extensions