HTMLMediaElement.readyState

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句法
范例
规范
浏览器兼容性
另请参阅
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HTMLMediaElement.readyState property indicates the readiness state of the media.

句法

var readyState = audioOrVideo.readyState;

值

An unsigned short . Possible values are:

常量	值	描述
`HAVE_NOTHING`	0	No information is available about the media resource.
`HAVE_METADATA`	1	Enough of the media resource has been retrieved that the metadata attributes are initialized. Seeking will no longer raise an exception.
`HAVE_CURRENT_DATA`	2	Data is available for the current playback position, but not enough to actually play more than one frame.
`HAVE_FUTURE_DATA`	3	Data for the current playback position as well as for at least a little bit of time into the future is available (in other words, at least two frames of video, for example).
`HAVE_ENOUGH_DATA`	4	Enough data is available—and the download rate is high enough—that the media can be played through to the end without interruption.

范例

This example will listen for audio data to be loaded for the element `example`. It will then check if at least the current playback position has been loaded. If it has, the audio will play.

<audio id="example" preload="auto">
 <source src="sound.ogg" type="audio/ogg" />
</audio>

var obj = document.getElementById('example');
obj.addEventListener('loadeddata', function() {
  if(obj.readyState >= 2) {
    obj.play();
  }
});

规范

规范	状态	注释
HTML 实时标准 The definition of 'HTMLMediaElement.readyState' in that specification.	实时标准
HTML5 The definition of 'HTMLMediaElement.readyState' 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
`readyState`	Chrome 43	Edge 12	Firefox 3.5	IE 9	Opera Yes	Safari 6	WebView Android 43	Chrome Android 43	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android 4.0

图例

完整支持

另请参阅

The interface defining it, HTMLMediaElement .

元数据

最后修改： Mar 18, 2019

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句法

值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题