function __construct()
{
//构造函数
$this->obj_base = $GLOBALS["obj_base"];
$this->config = $this->obj_base->config;
$_arr_cfg["admin"] = true;
$this->obj_tpl = new CLASS_TPL(BG_PATH_TPLSYS . "install/" . BG_DEFAULT_UI, $_arr_cfg);
$this->obj_dir = new CLASS_DIR();
$this->obj_dir->mk_dir(BG_PATH_CACHE . "ssin");
$this->install_init();
}