摘要：
前端获取参数[code] => [iv] =>[encryptedData] =>微信session_key接口h... 前端获取参数
[code] => [iv] => [encryptedData] =>
微信session_key接口
https://api.weixin.qq.com/sns/jscode2session?appid=$appId&secret=$appSecret&js_code=$code&grant_type=authorization_code
返回数据
[session_key] => [openid] =>
session_key解密数据
[phoneNumber] => [purePhoneNumber] => [countryCode] => 86 [watermark] => Array ( [timestamp] => [appid] => )
