js仿微信语音播放实现思路

<div class="app-voice-you" voiceSrc="xx.mp3">
<img class="app-voice-headimg" src="xx.png" />
<div style="width: 60%;" class="app-voice-state-bg">
<div class="app-voice-state app-voice-pause"></div>
</div>
<div class="app-voice-time app-voice-unread">
1'6"
</div>
</div>
<!--语音播放控件-->
<audio id="audio_my" src="">
Your browser does not support the audio tag.
</audio>

//this是点击的语音的document
var app_voice_time = this.getElementsByClassName("app-voice-time")[0];
  if(app_voice_time.className.indexOf("app-voice-unread") != -1){
    //存在红点时，把红点样式删除
    app_voice_time.className = app_voice_time.className.replace("app-voice-unread","");
  }

//语音播放完事件（PAGE.audio是audio控件的document）
 PAGE.audio.addEventListener('ended', function () {
   //循环获取下一个节点
  PAGE.preVoice = PAGE.currentVoice;
  var currentVoice = PAGE.currentVoice;
    while(true){
      currentVoice = currentVoice.nextElementSibling;//下一个兄弟节点
      //已经到达最底部
      if(!currentVoice){
        PAGE.preVoice.getElementsByClassName("app-voice-state")[0].className = "app-voice-state app-voice-pause";
        return false;
      }
      var voiceSrc = currentVoice.getAttribute("voiceSrc");
      if(voiceSrc && voiceSrc != ""){
        break;
      }
    }
    if(!PAGE.autoNextVoice){
      PAGE.preVoice.getElementsByClassName("app-voice-state")[0].className = "app-voice-state app-voice-pause";
      return false;
    }
    PAGE.currentVoice = currentVoice;
    //获取得到下一个语音节点，播放
      PAGE.audio.src = voiceSrc;
      PAGE.audio.play();
      PAGE.Event_PlayVoice();
}, false);

.app-voice-pause,.app-voice-play{
  height: 18px;
  background-repeat: no-repeat;
  background-image: url(../img/voice.png);
  background-size: 18px auto;
  opacity: 0.5;
}
 .app-voice-you .app-voice-pause{
  /*从未播放*/
  background-position: 0px -39px;
}
.app-voice-you .app-voice-play{
  /*播放中（不需要过渡动画）*/
  background-position: 0px -39px;
  -webkit-animation: voiceplay 1s infinite step-start;
  -moz-animation: voiceplay 1s infinite step-start;
  -o-animation: voiceplay 1s infinite step-start;
  animation: voiceplay 1s infinite step-start;
}
@-webkit-keyframes voiceplay {
  0%,
  100% {
    background-position: 0px -39px;
  }
  33.333333% {
    background-position: 0px -0px;
  }
  66.666666% {
    background-position: 0px -19.7px;
  }
}