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通过本例子，可以学习到全局变量使用。首先对比一下页面中的共享变量是如何设置的。页面的共享变量被设置在页面Page方法的object对象上，比如data就是object对象的一个属性。所以，我们在其他方法中才能够多次使用this.data的方式引用这个data对象。页面的共享变量应该在页面中设置，所以全局共享变量自然应该在应用程序级别设置。小程序提供了一个全局方法getApp()，用于获取小程序的App对象。

var pageObject = {
  data: {
    playing:false,
    playingSongsNum:0,
    musicGroupName:items[0],
    listTemplateName:'music-play-list',
    actionSheetHidden: true,
    actionSheetItems: items,
    playBar:{
      dataUrl:'http://stream.qqmusic.tc.qq.com/137192078.mp3',
      name: '告白气球',
      singer:'周杰伦',
      coverImgUrl: 'http://y.gtimg.cn/music/photo_new/T002R90x90M000003RMaRI1iFoYd.jpg'
    },
    songsList:_songsList,
    albumList :_albumList
  },
  playButtonTap:function(){
    var that = this

  },
  actionSheetTap: function(e) {
    this.setData({
      actionSheetHidden: !this.data.actionSheetHidden
    })
  },
  actionSheetChange: function(e) {
    this.setData({
      actionSheetHidden: !this.data.actionSheetHidden
    })
  },
  onLoad: function () {
    var that = this
    wx.onBackgroundAudioStop(function () {
      that.setData({
        playing: false
      })
    })
  },
  play: function (event) {
    var that = this
    var res=that.data.songsList[event.currentTarget.dataset.num]
    getApp().globalData.playing = res
    that.setData({
          playBar:res,
          playingSongsNum:event.currentTarget.dataset.num
    })
    wx.playBackgroundAudio({
      dataUrl: res.dataUrl,
      name: res.name,
      singer:res.singer,
      coverImgUrl: res.coverImgUrl,
      complete: function (res) {
        that.setData({
          playing: true
        })
      }
    })
  },
  pause: function () {
    var that = this
    wx.pauseBackgroundAudio({
      success: function () {
        that.setData({
          playing: false
        })
      }
    })
  },
  onUnload: function () {
    clearInterval(this.updateInterval)
  },
  onShow:function(){
    var that = this
    
      wx.request({
        url: 'http://120.27.93.97/weappserver/get_music.php',
        data: {
          mid: getApp().globalData.playing.mid
        },
        header: {
            'Content-Type': 'text/html;charset=utf-8'
        },
        success: function(res) {
          console.log(res.data)
          var obj=that.data.playBar
          obj['coverImgUrl']='http:'+res.data
          that.setData({
            playBar:obj
          })
        }
      })
      that.setData({
        playing: true,
        playBar: getApp().globalData.playing
      })
  }
}

 for (var i = 0; i < items.length; ++i) {
   (function(itemName) {
     switch(itemName){
       case '播放列表':
          pageObject['bind' + itemName] = function(e) {
          console.log('click' + itemName, e)
          this.setData({
            musicGroupName:itemName,
            listTemplateName:'music-play-list',
            templateData:null,
            actionSheetHidden: !this.data.actionSheetHidden
          })
        }
       break;

       case '歌曲':
          pageObject['bind' + itemName] = function(e) {
          console.log('click' + itemName, e)
          this.setData({
            musicGroupName:itemName,
            listTemplateName:'songs-list',
            templateData:_songsList,
            actionSheetHidden: !this.data.actionSheetHidden
          })
        }
       break;

       case '专辑':
          pageObject['bind' + itemName] = function(e) {
          console.log('click' + itemName, e)
          this.setData({
            musicGroupName:itemName,
            listTemplateName:'album-list',
            templateData:_albumList,
            actionSheetHidden: !this.data.actionSheetHidden
          })
        }
       break;

       case '演唱者':
          pageObject['bind' + itemName] = function(e) {
          console.log('click' + itemName, e)
          this.setData({
            musicGroupName:itemName,
            listTemplateName:'singer-list',
            templateData:null,
            actionSheetHidden: !this.data.actionSheetHidden
          })
        }
       break;
     }

   })(items[i])
 }

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