onTimeUpdate(){

    console.log('hello');

    //需要更新的数据

    const update = {

        duration: audio.duration,

        currentTime: audio.currentTime,

        paused: audio.paused,

        buffered: audio.buffered

    }

    //数据合并

    Object.assign(this.data.song,update);

    this.setData({

        song:this.data.song

    })

}