升级到152900后，image组件的bindtap事件，取不到图片地址啦，

<image src=“{{item.img}}” id=“{{index}}” bindtap=“previewImage” class=“photo” mode=“aspectFill” />

 //大图预览

  previewImage: function (e) {

    console.log(e);

    var current = e.target.dataset.src;

    wx.previewImage({

      current: current,

      urls: [current]

    })

  },

current是undefined！！