App({
 onLaunch: function () {
  /*初始化APP自动登陆
  * 您也可以在任何地方进行用户登陆验证 
  *用法：首先在js文件中定义 var app = getApp(); app.getUserDataToken();
  */
  this.getUserDataToken();
 },
 getUserDataToken:function(){
   var that = this;
   //获取用户缓存token 此token是服务器作为用户唯一验证的标识，具体请看后端代码
   var utoken=wx.getStorageSync("utoken");
    wx.login({
     success: function (res) {
      var code=res.code;
      wx.getUserInfo({
       success: function (res) {
        wx.request({
         //用户登陆URL地址，请根据自已项目修改
         url: 'https://66018954.qcloud.la/WxApp/index.php/UserApi/userAuthSlogin',
         method:"POST",
         data: {
           utoken:utoken,
           code: code,
           encryptedData:res.encryptedData,
           iv:res.iv
         },
         fail:function(res){
         },
         success: function(res) {
          var utoken=res.data.utoken;
          //设置用户缓存
          wx.setStorageSync("utoken",utoken);
         }
        })
       }
      })
     }
   })
 }
})

public function userAuthSlogin(){
    $content = file_get_contents ( 'php://input' );
    $content=json_decode($content,true);
    $utoken=$content["utoken"];
    if(!empty($utoken)&&S($utoken)){
      $result["success"]=1;
      $result['utoken']=$utoken;
      echo json_encode($result);
      exit();
    }
    $code=$content["code"];
    $encryptedData=$content["encryptedData"];
    $iv = $content['iv'];
    /*获取session_key*/
    $s_result=$this->getSession($code);
    $WxData = new WXBizDataCrypt($s_result['appid'],$s_result['session_key']);
    /*解密用户数据*/
    $errCode = $WxData->decryptData($encryptedData, $iv, $user_data);
    $wxap_key = md5(uniqid(md5(microtime(true)),true));
    $result=array();
    if($errCode==0){
      $user_data=json_decode($user_data,true);
      $result["success"]=1;
      $result['utoken']=$wxap_key;
      $user_id = $this->wxUserAdd($user_data);
      if($user_id < 1 || empty($user_id)){
        $result["success"]=-1;
        $result['errCode']=0;
        $result['msg']="获取用户信息出错！";
        echo json_encode($result);
        exit();
      }
      $user_data['uid']=$user_id;
      S($wxap_key,$user_data,7200);
      echo json_encode($result);
      exit();
    }else{
      $result["success"]=-1;
      $result['errCode']=$errCode;
      $result['msg']="获取用户信息出错！";
      echo json_encode($result);
      exit();
    }
  }