HTMLMediaElement.playbackRate

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HTMLMediaElement.playbackRate property sets the rate at which the media is being played back. This is used to implement user controls for fast forward, slow motion, and so forth. The normal playback rate is multiplied by this value to obtain the current rate, so a value of 1.0 indicates normal speed.

若 playbackRate is negative, the media is not played backwards.

The audio is muted when the fast forward or slow motion is outside a useful range (for example, Gecko mutes the sound outside the range 0.25 to 5.0 ).

The pitch of the audio is corrected by default and is the same for every speed. Some browsers implement the non-standard HTMLMediaElement.preservesPitch property to control this.

句法

// video
video.playbackRate = 1.5;
// audio
audio.playbackRate = 1.0;

值

A double . 1.0 is "normal speed," values lower than 1.0 make the media play slower than normal, higher values make it play faster. ( 默认： 1.0 )

范例

var obj = document.createElement('video');
console.log(obj.playbackRate); // Expected Output: 1

规范

规范	状态	注释
HTML 实时标准 The definition of 'HTMLMediaElement.playbackRate' in that specification.	实时标准
HTML5 The definition of 'HTMLMediaElement.playbackRate' in that specification.	推荐

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
`playbackRate`	Chrome 43	Edge 12	Firefox 20	IE 9	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 20	Opera Android ?	Safari iOS ?	Samsung Internet Android Yes

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完整支持
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The interface defining it, HTMLMediaElement .

元数据

最后修改： Nov 21, 2019

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句法

值

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浏览器兼容性

图例

另请参阅

相关话题