<image style="width: {{imgWidth}}px;height: {{imgWidth}}px;" src="{{subitem}}" lazy-load="{{true}}" mode="aspectFit" class="image" bindtap="previewImg" data-imgindex="{{index}}" data-currentsrc="{{subitem}}"></image>

previewImg(e) {
      const {albumList} = this.data
      console.log(albumList[e.currentTarget.dataset.imgindex])
      console.log(e.currentTarget.dataset.currentsrc)
      wx.previewImage({
        current: e.currentTarget.dataset.currentsrc,
        urls: albumList[e.currentTarget.dataset.imgindex]
      })
    }