Component({
  data: {
    audio: null,
    currentTime: 0,
    duration: 0
  },
  attached() {
    const audio = wx.createInnerAudioContext()
    this.setData({ audio })
    audio.src = "https://1257107138.vod2.myqcloud.com/288f6a2cvodsh1257107138/3291a5fe5285890810640015371/Wrtjv5effAcA.mp3" // 往前seek无效
    // audio.src = "https://1257107138.vod2.myqcloud.com/c99bf365vodcq1257107138/bc830cfd5285890805589477059/KbZsADrsIiEA.mp3" // 正常seek
    audio.onTimeUpdate(() => {
      console.log('onTimeUpdate')
      this.setData({
        currentTime: audio.currentTime
      })
    })
    const getDurationTimer = setInterval(() => {
      if (audio.duration) {
        clearInterval(getDurationTimer)
        this.setData({ duration: audio.duration })
      }
    }, 100)
  },
  methods: {
    moved(event) {
      const audio = this.data.audio
      audio.pause() // 修复seek后onTimeUpdate监听失效
      audio.seek(event.detail.value)
      setTimeout(audio.play, 50) // 修复seek后onTimeUpdate监听失效
    },
    play() {
      this.data.audio.play()
    },
    pause() {
      this.data.audio.pause()
    },
    stop() {
      this.data.audio.stop()
    }
  }
})

<slider
  class="slider"
  value="{{ currentTime }}" 
  min="0" 
  max="{{ duration }}"
  bindchange="moved"
></slider>
<button bindtap="play">播放</button>
<button bindtap="pause">暂停</button>
<button bindtap="stop">停止</button>

// ******************************************************************************************************************************************************

向左拖动音频进度条，触发seek事件，但是无效。（ios端和工具端正常）