function __construct()
{
//构造函数
$this->obj_api = new CLASS_API();
$this->obj_api->chk_install();
$this->log = $this->obj_api->log;
$this->obj_crypt = new CLASS_CRYPT();
$this->obj_sign = new CLASS_SIGN();
$this->mdl_pm = new MODEL_PM();
$this->mdl_app = new MODEL_APP();
$this->mdl_log = new MODEL_LOG();
$this->mdl_user = new MODEL_USER();
}