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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

loopEnd 特性为 AudioBufferSourceNode interface specifies is a floating point number specifying, in seconds, at what offset into playing the AudioBuffer playback should loop back to the time indicated by the loopStart property. This is only used if the loop 特性为 true .

句法

AudioBufferSourceNode.loopEnd = endOffsetInSeconds;
var endOffsetInSeconds = AudioBufferSourceNode.loopEnd;
					

值

A floating-point number indicating the offset, in seconds, into the audio buffer at which each loop will loop return to the beginning of the loop (that is, the current play time gets reset to AudioBufferSourceNode.loopStart ). This property is only used if the loop 特性为 true .

默认值为 0。

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 slider controls are used to change the playbackRate , loopStart and loopEnd properties on the fly.

When the audio is played to the end, it loops, but you can control how long the loops last by altering loopStart and loopEnd . For example, if you set their values to 20 and 25, respectively, then begin playback, the sound will play normally until it reaches the 25 second mark. Then the current play position will loop back to the 20 second mark and continue playing until the 25 second mark, ad infinitum (or at least until stop() is called).

For a full working example, see this code running 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;
        songLength = buffer.duration;
        source.buffer = myBuffer;
        source.playbackRate.value = playbackControl.value;
        source.connect(audioCtx.destination);
        source.loop = true;
        loopstartControl.setAttribute('max', Math.floor(songLength));
        loopendControl.setAttribute('max', Math.floor(songLength));
      },
      function(e){"Error with decoding audio data" + e.err});
  }
  request.send();
}
  ...
loopstartControl.oninput = function() {
  source.loopStart = loopstartControl.value;
  loopstartValue.innerHTML = loopstartControl.value;
}
loopendControl.oninput = function() {
  source.loopEnd = loopendControl.value;
  loopendValue.innerHTML = loopendControl.value;
}
					

规范

规范	状态	注释
Web 音频 API The definition of 'loopEnd' 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
loopEnd	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

完整支持

不支持

不支持

另请参阅

• Web 音频 API
• 使用 Web 音频 API

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. Web 音频 API
2. AudioBufferSourceNode
3. 构造函数

   1. AudioBufferSourceNode()
4. 特性

   1. buffer
   2. detune
   3. loop
   4. loopEnd
   5. loopStart
   6. playbackRate
5. 方法

   1. start()
6. 继承：

   1. AudioScheduledSourceNode
   2. AudioNode
   3. EventTarget
7. Related pages for Web Audio API

   1. AnalyserNode
   2. AudioBuffer
   3. AudioContext
   4. AudioContextOptions
   5. AudioDestinationNode
   6. AudioListener
   7. AudioNode
   8. AudioNodeOptions
   9. AudioParam
   10. AudioProcessingEvent
   11. AudioScheduledSourceNode
   12. AudioWorklet
   13. AudioWorkletGlobalScope
   14. AudioWorkletNode
   15. AudioWorkletProcessor
   16. BaseAudioContext
   17. BiquadFilterNode
   18. ChannelMergerNode
   19. ChannelSplitterNode
   20. ConstantSourceNode
   21. ConvolverNode
   22. DelayNode
   23. DynamicsCompressorNode
   24. GainNode
   25. IIRFilterNode
   26. MediaElementAudioSourceNode
   27. MediaStreamAudioDestinationNode
   28. MediaStreamAudioSourceNode
   29. OfflineAudioCompletionEvent
   30. OfflineAudioContext
   31. OscillatorNode
   32. PannerNode
   33. PeriodicWave
   34. StereoPannerNode
   35. WaveShaperNode