【高级技巧】Lua遍历中改表：沙巴克守城名单的next未定义行为

local function kickOffline(list)
    for name, info in pairs(list) do
        if info.online == 0 then
            list[name] = nil
            list[name .. "_退"] = info   -- 遍历中新增键，未定义
        end
    end
end

local function kickOffline(actor, list)
    local gone = {}
    for name, info in pairs(list) do
        if info.online == 0 then
            gone[#gone + 1] = name   -- 一阶段只收集
        end
    end
    for i = 1, #gone do
        list[gone[i]] = nil          -- 二阶段统一处置
    end
    sendmsg(actor, 1, "沙巴克名单移出 " .. #gone .. " 名离线")
end