AudioBufferSourceNode.loop

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loop 特性为 AudioBufferSourceNode interface is a Boolean indicating if the audio asset must be replayed when the end of the AudioBuffer is reached.

loop property's default value is false .

句法

var loopingEnabled = AudioBufferSourceNode.loop;
AudioBufferSourceNode.loop = true | false;

值

A Boolean which is true if looping is enabled; otherwise, the value is false .

When looping is enabled, the sound begins playing at the time specified as the start point when start() is called. When the time specified by the loopEnd property is reached, playback continues at the time specified by loopStart

范例

在此范例中， AudioContext.decodeAudioData function is used to decode an audio track and put it into an AudioBufferSourceNode . Buttons are provided to play and stop the audio playback, and a slider control is used to change the playbackRate property value on the fly. When the audio is played, it loops.

You can run the full example live (或 view the source )。

function getData() {
  source = audioCtx.createBufferSource();
  request = new XMLHttpRequest();
  request.open('GET', 'viper.ogg', true);
  request.responseType = 'arraybuffer';
  request.onload = function() {
    var audioData = request.response;
    audioCtx.decodeAudioData(audioData, function(buffer) {
        myBuffer = buffer;
        source.buffer = myBuffer;
        source.playbackRate.value = playbackControl.value;
        source.connect(audioCtx.destination);
        source.loop = true;
      },
      function(e){"Error with decoding audio data" + e.err});
  }
  request.send();
}
// wire up buttons to stop and play audio, and range slider control
play.onclick = function() {
  getData();
  source.start(0);
  play.setAttribute('disabled', 'disabled');
  playbackControl.removeAttribute('disabled');
}

规范

规范	状态	注释
Web 音频 API The definition of 'loop' 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
`loop`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS Yes	Samsung Internet Android 1.0

图例

完整支持
不支持

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元数据

最后修改： 2020 年 1 月 22 日

Web 音频 API
AudioBufferSourceNode
构造函数
1. AudioBufferSourceNode()
特性
1. buffer
2. detune
3. loop
4. loopEnd
5. loopStart
6. playbackRate
方法
1. start()
继承：
Related pages for Web Audio API

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句法

值

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规范

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图例

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