微信小程序怎么点击查看原图

<view class=&#39;detail_img&#39;>
        <view class=&#39;view_img&#39; wx:for="{{imglist}}" wx:for-item="image" wx:for-index="idx">
          <image src=&#39;{{image}}&#39; data-idx="{{idx}}" bindtap="previewImage"></image>
        </view>
        <view style=&#39;clear:both;&#39;></view>
    </view>

data: {
    previewlist:['预览图链接','预览图链接','预览图链接'],
    originallist:['原图链接','原图链接','原图链接']
  },

/**   
     * 预览图片  
     */
  previewImage: function (e) {
    var current = this.data.originallist[e.target.dataset.idx];
    wx.previewImage({
      current: current, // 当前显示图片的http链接  
      urls: this.data.originallist// 需要预览的图片http链接列表  
    })
  } ,