public function __construct()
{
$this->model = model('Base')->model;
$this->cloud = Cloud::getInstance();
// 定义当前请求的系统常量
define('NOW_TIME', $_SERVER['REQUEST_TIME']);
define('REQUEST_METHOD', $_SERVER['REQUEST_METHOD']);
define('IS_GET', REQUEST_METHOD == 'GET' ? true : false);
define('IS_POST', REQUEST_METHOD == 'POST' ? true : false);
define('IS_PUT', REQUEST_METHOD == 'PUT' ? true : false);
define('IS_DELETE', REQUEST_METHOD == 'DELETE' ? true : false);
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');
}
