【进阶实战】邮件一键领取：批量附件的循环校验封装

local function claimOne(actor, id)
    local has = getsysvar("MailAttach_" .. id) or ""
    local item, cnt = string.match(has, "^(.-)|(%d+)$")
    if not item or tonumber(cnt) <= 0 then
        return false
    end
    setsysvarex("MailAttach_" .. id, "", 1)
    giveitem(actor, item, tonumber(cnt), 0, "邮件领取")
    return true
end

local function claimAll(actor, mailIds)
    local okCount, failCount = 0, 0
    for _, id in ipairs(mailIds) do
        if claimOne(actor, id) then
            okCount = okCount + 1
        else
            failCount = failCount + 1
        end
    end
    sendmsg(actor, 1, "领取完成：成功 " .. okCount
        .. " 封，失败 " .. failCount .. " 封。")
end