wxml页面：

<image src=\'{{UPLOAD_IMAGES_URL}}{{vv.img_s}}\' data-src="{{vv.img}}" bindtap="previewImage"></image>

js：

/*预览*/
previewImage:function(e){
    console.log(\'previewImage\');
    var current = e.currentTarget.dataset.src;
    var that = this;
    var url = [that.data.UPLOAD_IMAGES_URL+current];
    wx.previewImage({
        current: current, // 当前显示图片的http链接
        urls: url // 需要预览的图片http链接列表
    })
}