【高级技巧】外观模式：复杂子系统的统一门面封装

local Siege = {}
function Siege.launch(actor, guildName)
    if not Siege.check(actor) then
        return false
    end
    Siege.charge(guildName)
    Siege.makeFlag(guildName)
    Siege.broadcast(guildName)
    Siege.openRoster(guildName)
    sendmsg(actor, 1, "攻城申请完成。")
    return true
end

function Siege.check(actor)
    local lv = tonumber(getplayvar(actor, 0, "Level")) or 0
    return lv >= 50
end
function Siege.charge(guildName)
    setsysvarex("SiegeFund_" .. guildName,
        (tonumber(getsysvar("SiegeFund_" .. guildName)) or 0) + 100000, 1)
end