Menu items only for registered users

How can I in Drupal define that menu item link is available only f开发者_StackOverflow中文版or registered users, and not for users that are not loged in?

Just make sure the node this menu item leads to can be accessed only by registered users. Try access control modules if there's no inbuilt mechanism that works for you. I sometimes use Content Access for that, although it's primarily for controlling access per content type. You can try Nodeaccess, which controls access per node.