小程序怎么做音乐播放条

 <view class="audio-play">
    <audio src=""></audio>
  </view>
  
  <view>
    <view class="one-column play-it" bindtap="playMusic">
      <view>点击播放</view>
    </view>
    
    <progress class="music-prog" bindtouchmove="setTouchMove" percent="{{musicPercent}}"></progress>
    
    <view class="percent-num">{{musicPercent}}%</view>
  </view>

.play-it{
  margin-left: 300rpx;
}

.music-prog{
  width: 550rpx;
  height: 10rpx;
  margin: 50rpx 100rpx;
  color: #0099ff;
  background-color: #999;
}

.percent-num{
  margin: -20rpx 0 0 100rpx;
  font-size: 28rpx;
}

onShow() {
    // 监听音乐播放
    let that = this
    wx.onBackgroundAudioPlay(() => {
      that.timer && clearInterval(that.timer)
      that.timer = setInterval(() => {
        wx.getBackgroundAudioPlayerState({
          success: res => {
            let per = (res.currentPosition/res.duration)*10000
            that.setData({
              musicPercent: Math.round(per)/100 + '',
              duration: res.duration
            })
          }
        })
      }, 1000)
    })

    // 监听背景音频暂停事件
    wx.onBackgroundAudioPause(() => {
      clearInterval(that.timer)
    })

    // 监听背景音频停止事件
    wx.onBackgroundAudioStop(() => {
      clearInterval(that.timer)
    })
  },
  
  playMusic() {
 	 let obj = {
       dataUrl: 'http://p6jceeddp.bkt.clouddn.com/%E5%B0%A4%E9%95%BF%E9%9D%96%20-%20%E6%98%A8%E6%97%A5%E9%9D%92%E7%A9%BA.mp3',
        title: '昨日青空',
        coverImgUrl: '/static/images/avatar.png'
      }
      wx.playBackgroundAudio(obj)
    },
 
  setTouchMove (e) {
    if(e.touches[0].clientY >= 390 && e.touches[0].clientY <= 410) {
      if (e.touches[0].clientX >= 55 && e.touches[0].clientX <= 355) {
        let percent = (e.touches[0].clientX - 55)/300*10000
        this.setData({
          musicPercent: Math.round(percent)/100 + ''
        })
        this.data.current = (this.data.musicPercent/100)*this.data.duration
      }
    }
  },
  
  setProgress() {
    let that = this
    console.log('bindtouchend')
    wx.getBackgroundAudioPlayerState({
      success: res => {
        that.data.current !== res.currentPosition &&
        wx.seekBackgroundAudio({
          position: that.data.current,
          success () {
            console.log('seek', that.data.current)
          }
        })
      }
    })
  }