var API_URL = "自己的服务器地址";
Page({
 onLoad: function () {
 console.log("iv");
 wx.login({//login流程
 success: function (res) {//登录成功
 if (res.code) {
 var code = res.code;
 wx.getUserInfo({//getUserInfo流程
 success: function (res2) {//获取userinfo成功
 console.log(res2);
 var encryptedData = encodeURIComponent(res2.encryptedData);//一定要把加密串转成URI编码
  var iv = res2.iv;
  //请求自己的服务器
  Login(code,encryptedData,iv);
 }
 })

 } else {
 console.log('获取用户登录态失败！' + res.errMsg)
 }
 }
});
} 
})

function Login(code,encryptedData,iv){ console.log('code='+code+'&encryptedData='+encryptedData+'&iv='+iv);
 //创建一个dialog
  wx.showToast({
  title: '正在登录...',
  icon: 'loading',
  duration: 10000
  });
  //请求服务器
  wx.request({
  url: API_URL,
  data: {
  code:code,
  encryptedData:encryptedData,
  iv:iv
  },
  method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
  header: {
  'content-type': 'application/json'
  }, // 设置请求的 header
  success: function (res) {
  // success
  wx.hideToast();
  console.log('服务器返回'+res.data);

  },
  fail: function () {
  // fail
  // wx.hideToast();
  },
  complete: function () {
  // complete
  }
  })
 }

/**
 * 登录
 * 
 * @return Response
 */
 public function weixinlogin( $user_id=null )
 {
  global $App_Error_Conf,$Gift_Ids,$Server_Http_Path,$Is_Local,$Test_User,$Good_Vcode,$WeiXin_Xd_Conf;
  $validator_result = input_validator(array('code','iv','encryptedData'));
  if(!empty($validator_result)){
   return response($validator_result);
  }
  $js_code = $_REQUEST['code'];
  $encryptedData = $_REQUEST['encryptedData'];
  $iv = $_REQUEST['iv'];
  $appid = $WeiXin_Xd_Conf['appid'];
  $secret = $WeiXin_Xd_Conf['secret'];
  $grant_type = $WeiXin_Xd_Conf['grant_type'];
  //从微信获取session_key
  $user_info_url = $WeiXin_Xd_Conf['code2session_url'];
  $user_info_url = sprintf("%s?appid=%s&secret=%s&js_code=%s&grant_type=%",$user_info_url,$appid,$secret,$js_code,$grant_type);
  $weixin_user_data = json_decode(get_url($user_info_url));
  $session_key = $weixin_user_data->session_key;
//解密数据
$data = '';
$wxBizDataCrypt = new WXBizDataCrypt($appid, $session_key);
$errCode=$wxBizDataCrypt>decryptData($appid,$session_key,$encryptedData, $iv, $data );