代码如下
innerAudioContext.onCanplay(() => {
    innerAudioContext.duration;
    setTimeout(() => {
      console.log(innerAudioContext, "innerAudioContext")
      console.log(innerAudioContext.duration, "innerAudioContext.duration")
      this.setData({
       duration: innerAudioContext.duration
      })
    }, 1000)
 })