1.頁面需要用到繫結的方法getPhoneNumber獲取iv和encryptedData，

getPhoneNumber (e) {
    console.log(e.detail.iv)            //加密演算法的初始向量
    console.log(e.detail.encryptedData) //包括敏感資料在內的完整使用者資訊的加密資料
  }

2.使用wx.login獲取code

<button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber"></button>

wx.login({
      success(res) {
        if (res.code) {
          app.globalData.code = res.code //res.code重點為了獲取session_key
        } else {
        }
      }
    })

3.獲取到code之後，傳入自己的API介面中獲取session_key

/// <summary>
        ///登入呼叫login介面獲取openid和session_key
        /// </summary>
        /// <param name="code">
 
前臺通過呼叫login介面獲取到的code</param>
        /// <param name="anonymous_code">前臺通過呼叫login介面獲取到的anonymous_code</param>
        /// <returns></returns>
        public string LoginGetopenid(string code, string anonymous_code)//未效驗
        {

            //按照規則填寫引數
            string appid = "
 
***********";
            string secret = "***************************";
            string session_key = "";
            //地址（這裡對地址和引數進行了分開處理，url為地址，postString為引數） 
            string url = "https://developer.toutiao.com/api/apps/jscode2session";
            //這裡即為傳遞的引數，可以用工具抓包分析，也可以自己分析，主要是form裡面每一個name都要加進來
            string GETString = "appid=" + appid + "&secret=" + secret + "&code=" + code + "&anonymous_code=" + anonymous_code;
            //編碼，尤其是漢字，事先要看下抓取網頁的編碼方式  
            byte[] GETData = Encoding.UTF8.GetBytes(GETString);

            //初始化WebClient類（提供將資料傳送到url的資源，及從這樣的資源接收資料）
            WebClient webClient = new WebClient();
            ////採取POST方式必須加的header，如果改為GET方式的話就去掉這句話即可
            //webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");

            string requestUrl = url + "?" + GETString;
            //得到解碼的返回字元流
            string responseData = Encoding.UTF8.GetString(webClient.DownloadData(requestUrl));
            //解碼後將資料轉換為Json型別的object
            JObject returnJSON = (JObject)JsonConvert.DeserializeObject(responseData);
            //賦值如果未獲取到openid則登入失敗，否則成功
            dynamic objJson = new ExpandoObject();
            if (returnJSON["openid"] != null || returnJSON["openid"].ToString() != "")
            {
                int error = Convert.ToInt32(returnJSON["error"]);
                string openid = returnJSON["openid"].ToString();
                session_key = returnJSON["session_key"].ToString();
                string anonymous_openid = returnJSON["anonymous_openid"].ToString();
                //查詢賬號是否是使用者
                Maticsoft.BLL.T_User userBLL = new Maticsoft.BLL.T_User();
                DataTable dt = userBLL.SelectUserByopenid(openid);
              
            }
           
            
            return session_key;
        }

4.此時iv、encryptedData、session_key三個引數我們有了值使用Encrypt.DecryptAesForWeChart方法進行AES解密

    private string getPhoneNumber(string encryptedData, string IV, string Session_key)
        {
            try
            {
                byte[] encryData = Convert.FromBase64String(encryptedData);
                RijndaelManaged rijndaelCipher = new RijndaelManaged();
                rijndaelCipher.Key = Convert.FromBase64String(Session_key);
                rijndaelCipher.IV = Convert.FromBase64String(IV);
                rijndaelCipher.Mode = CipherMode.CBC;
                rijndaelCipher.Padding = PaddingMode.PKCS7;
                ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
                byte[] plainText = transform.TransformFinalBlock(encryData, 0, encryData.Length);
                string result = Encoding.Default.GetString(plainText);

                dynamic model = Newtonsoft.Json.Linq.JToken.Parse(result) as dynamic;
                return model.phoneNumber;

            }
            catch (Exception ex)
            {
                return "";
            }
        }