理解 Lua 中的类

我一直在 Lua 中探索如何定义“类”，以及为什么在定义“类”时会出现“Attempt to call field 'copy'(nil value)”这样的报错。

local factionClass = {}
factionClass.Name = "throwaway"

function factionClass:New(name)
    local newFaction = table.Copy(factionClass)
    if name then
        newFaction.Name = name
    end
    return newFaction
end

factionCoolguys = Faction("cool guys")