function list_iter(t) local i = 0 local n = table.getn(t) return function() i = i + 1 if i <= n then return t[i] end end end t = {10, 20, 30} iter = list_iter(t) while true do local element = iter() if element == nil then break end print(element) end
原文：http://www.cnblogs.com/zzyoucan/p/5891122.html