onLoad: function (options) {

    var that = this

    api.Login(function (login) {

      var codeModel = new function () { }

      codeModel.scene = login.UserId

      codeModel.width=430

      codeModel.auto_color = false

      codeModel.line_color = { "r": "0", "g": "0", "b": "0" }

      console.log('----')

      api.RequestApiURL("WeixinAPI/CreateMyCode", { data: JSON.stringify(codeModel)}, function (e) {

        console.log(e)

        wx.hideLoading()

        console.log(e.data.data)

        that.setData({

          imgurl: e.data.data

        })

      })

    })

  }

 public string CreateMyCode(string data)

        {

            string gettokenurl = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", "appid", "AppSecret");

            string access_token = GetWebRequest(gettokenurl);

            if (access_token.IndexOf("access_token") > 0)

            {

                access_token = access_token.Substring(access_token.IndexOf(":") + 2,

                    access_token.IndexOf(",") - access_token.IndexOf(":") - 3);

            }

            string url = string.Format("http://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token={0}", access_token);

            var io = PostMoths(url, data);

            byte[] by = StreamToBytes(io);

            var rs = new ReturnResult<byte[]>(by);

            return rs.Serialize();

        }

  <view class="weui-media-box__hd_in-appmsg">

          <image class="weui-media-box__thumb" src="data:image/jpeg;base64,{{imgurl}}" />

        </view>