HTMLMediaElement.readyState - Web APIs 编辑

The HTMLMediaElement.readyState property indicates the readiness state of the media.

Syntax

var readyState = audioOrVideo.readyState;

Value

An unsigned short. Possible values are:

ConstantValueDescription
HAVE_NOTHING0No information is available about the media resource.
HAVE_METADATA1Enough of the media resource has been retrieved that the metadata attributes are initialized. Seeking will no longer raise an exception.
HAVE_CURRENT_DATA2Data is available for the current playback position, but not enough to actually play more than one frame.
HAVE_FUTURE_DATA3Data 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_DATA4Enough data is available—and the download rate is high enough—that the media can be played through to the end without interruption.

Examples

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();
  }

});

Specifications

SpecificationStatusComment
HTML Living Standard
The definition of 'HTMLMediaElement.readyState' in that specification.
Living Standard 
HTML5
The definition of 'HTMLMediaElement.readyState' in that specification.
Recommendation 

Browser compatibility

BCD tables only load in the browser

See also

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