使用Ajax设置html5媒体源

if (this.mAudioPlayer.canPlayType("audio/mpeg")) {    this.mExtension = '.mp3';}else if (this.mAudioPlayer.canPlayType("audio/ogg")) {    this.mExtension = '.ogg';} else if (this.mAudioPlayer.canPlayType("audio/mp4")) {    this.mExtension = '.m4a'; }this.CreateAudioData = function() {//downloading audio for use in data:uri$.ajax({    url: aAudioSource + this.mExtension + '.txt',    type: 'GET',    context: this,    async: false,    beforeSend: function(xhr) {xhr.setRequestHeader('Authorization', window.userId);},    success: this.EnpreAudioData,    error: function(xhr, aStatus, aError) { HandleError('Audio Error: ' + aStatus); }  });};this.EnpreAudioData = function(aData) {  //this.mAudioData = base64_enpre(aData);  this.mAudioData = aData;  if (this.mExtension == '.m4a') {    Debug("playing m4a");    this.mAudioSrc = "data:audio/mp4;base64," + this.mAudioData;  } else if (this.mExtension == '.ogg') {    Debug("playing ogg");    this.mAudioSrc = "data:audio/ogg;base64," + this.mAudioData;  } else if (this.mExtension == '.mp3') {    Debug("playing mp3");    this.mAudioSrc = "data:audio/mp3;base64," + this.mAudioData;  }};this.play = function() {   if (this.mAudioPlayer.src != this.mAudioSrc) {       this.mAudioPlayer.src = this.mAudioSrc;   }    this.mAudioPlayer.load();    this.mAudioPlayer.play();};

不得不执行asynch：false，否则我会得到一小部分音频，而不是全部音频。尽管删除了异步，最终使调试变得更加容易。