Page({
  data:{
      item:0,
      tab:0
    },
    changeTab:function(e){
      this.setData({
        tab:e.detail.current
      })
    },
    
    
    changeItem:function (e) {

      this.setData({
item: e.target.dataset.item
      })
    }
  })
  playlist:[{
    id:1,
    title:'祝你生日快乐',
    singer:'小丽',
    src:'http://127.0.0.1:3000/1.mp3',
    coverImgUrl:'/images/cover.jpg'
  },{
    id:2,
    title:'劳动最光荣',
    singer:'小明',
    src:'http://127.0.0.1:3000/1.mp3',
    coverImgUrl:'/images/cover.jpg'
  },{
    id:3,
    title:'龙的传人',
    singer:'小华',
    src:'http://127.0.0.1:3000/1.mp3',
    coverImgUrl:'/images/cover.jpg'
  },{
    id:4,
    title:'小星星',
    singer:'小红',
    src:'http://127.0.0.1:3000/1.mp3',
    coverImgUrl:'/images/cover.jpg'
  },{
    }],
    audioBam:null,
    onReady:function(){
      this.audioBam=wx.getBackgroundAudioManager()
      //默认选择第一种
      this.setMusic(0)
    },
    setMusic:function(index){
      //设置当前播放的曲目，在后面的步骤中实现
    }
    setMusic:function(index){
      var music =this.data.playlist[index]
      this.audioBam.src=music.src
      this.audioBam.title=music.title
      this.setData({
        playIndex:index,
        'play.title':music.title,
        'play.singer':music.singer,
        'play.coverImgUrl':music.coverImgUrl,
        "playcurrentTime":'00:00',
        "play.duration":'00:00',
        "play.percent":'0',
        state:'running'
        
      })
      play:function(){
        this.audioBam.play()
        this.setData({
          state:'running'
        })
      }
      pause:function(){
        this.audioBam.pause()
        this.setData({
          state:'paused'
        })
      }
      <image  src="'/images/03.png" bindtap="next"/>
      next function(){
        var index=this.data.playIndex>=this.data.playlist.length-1?0:this.data.playIndex+1
        this.setMusic(index)
      }
    }