<?php
namespace app\api\error\model;
class Success extends  ZskkErrorModel {
    protected $code = 0;
    protected $msg = '请求成功';
    protected $data = null;
    protected $error = null;
    private static $instance = null;

    public static function instance($data = null) {
        $instance = is_null(self::$instance) ? new Success() :self::$instance;
        return  $instance->setData($data);
    }
}