/**
	 * 通过业务id获取业务信息 
	 */
	public function getWorkInfoByWID($wid) {
		return WorkOper::getInstance()->getWorkInfoByWID($wid);
	}
	public static function getInstance() {
		if(!(self::$instance instanceof self)) {
			self::$instance = new self();
		}
		return self::$instance;
	}