微权获取openid信授

（1）首页要有一个自己的微信测试号的appid和秘钥

（2）公司里都是后台传code（接口），获取openid（接口）

请求code接口：/Wechat/GetUserInfo/getCode

//判断是否是移动设备打开

    function Isweixin(){

        var userAgentInfo = navigator.userAgent.toLowerCase();

        // var demainUrl ='http://faw-vw.ftms-wechat.com';

        var returnUrl =chineseTransfer(window.location);

        if (userAgentInfo.match(/MicroMessenger/i) == "micromessenger") {

            var code = getUrlParam("code");

            if (!code) {

                window.location = "/Wechat/GetUserInfo/getCode?callbackurl="+returnUrl;

            }else{

                getOpenId(code);

            }

        }else {

            //网页打开的

            // window.location = demainUrl+"/Wechat/GetUserInfo/getCode?callbackurl="+returnUrl;

            window.location = "/Wechat/GetUserInfo/getCode?callbackurl="+returnUrl;

        }

    }

    //获取code

    function getUrlParam(name) {

        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");

        var r = window.location.search.substr(1).match(reg);

        if (r != null) return unescape(r[2]);

        return null;

    }

// 请求openid

getOpenId = function (code) {

    $.ajax({

        type: 'POST',

      	url:"/Wechat/GetUserInfo/getUserInfo"，

        data: { code: code },

        success: function (res) {

             var data = res.data;

             console.log(data);

            var param = {

                    ass_openid :data.openid,

                    ass_name :data.nickname,

                    ass_head_img : data.headimgurl

            };

            localStorage.setItem("fromOpenid",param.ass_openid);

    });

}