微信小程序使用slider实现音频进度条

<view class='slider'>
    <slider bindchange='sliderChange' activeColor='red' block-size="12" value='{{audioTime}}' />
</view>
<view class='time'>
    {{playtime}} / {{alltime}}
</view>

var _self = this;
var innerAudioContext = this.data.innerAudioContext;
innerAudioContext.onCanplay(() => {
   //初始化duration
  innerAudioContext.duration
  setTimeout(function () {
      //延时获取音频真正的duration
      var duration = innerAudioContext.duration;
      var min = parseInt(duration / 60);
      var sec = parseInt(duration % 60);
      if (min.toString().length == 1) {
        min = `0${min}`;
      }
      if (sec.toString().length == 1) {
        sec = `0${sec}`;
      }
      _self.setData({
         audioDuration: duration,
         alltime: `${min}:${sec}`
      });
   }, 1000)
})

//设置一个计步器
clearInterval(this.data.durationIntval);
    this.data.durationIntval = setInterval(function () {
      //当音频在播放时执行
      if (_self.data.playing) {
        //获取音频的播放时间，进度百分比
        var seek = _self.data.audioSeek;
        var duration = innerAudioContext.duration;
        //当音频在播放时，每隔一秒音频播放时间+1，并计算分钟数与秒数
        var min = parseInt((seek + 1) / 60);
        var sec = parseInt((seek + 1) % 60);
        if (min.toString().length == 1) {
          min = `0${min}`;
        }
        if (sec.toString().length == 1) {
          sec = `0${sec}`;
        }        
        //当进度条完成，停止播放，并重设播放时间和进度条        
        var time = _self.data.audioTime;
        time = parseInt(100 * seek / duration);
        if (time >= 100) {
          innerAudioContext.stop();
          _self.setData({
            audioSeek: 0,
            audioTime: 0,
            audioDuration: duration,
            playing: 0,
            playtime: `00:00`,
          });
          return false;
        } else {
          //正常播放，更改进度信息，更改播放时间信息
          _self.setData({
            audioSeek: seek + 1,
            audioTime: time,
            audioDuration: duration,
            playtime: `${min}:${sec}`
          });
        }
      }
      console.log(_self.data);
    }, 1000);

var _self = this;
    //获取进度条百分比
    var value = e.detail.value;
    _self.setData({
      audioTime: value
    });
    var duration = _self.data.audioDuration;
    //根据进度条百分比及歌曲总时间，计算拖动位置的时间
    value = parseInt(value * duration / 100);
    console.log(value);
    //更改状态
    _self.setData({
      audioSeek: value
    });
    var innerAudioContext = _self.data.innerAudioContext;
    //调用seek方法跳转音频时间
    innerAudioContext.seek(value);
    //播放音频
    innerAudioContext.play();