怎麼了？你怎麼樣？

Can I use 怎麼了 or 你怎麼樣 as a very informal greeting (like "what's up?" or "how's it going?") with a friend, or do they sound m ore like "what's wrong?" (like I would say if I ran over to them right after they tripped and fell)

In general, is there a list of informal alternatives to 你好？I'm looking for the things in English like "hey," "how's it going," and "what's up."