/**
* 单例模式实例化当前模型类
*
* @access public
*
* @param object $modelObject 模型层例化对象名称
*
* @return object
*/
public static function getInstance($modelObject)
{
if (self::$_instance === null) {
self::$_instance = new self($modelObject);
}
return self::$_instance;
}
