【进阶实战】战场复活计时：复活倒计时的分段封装

local reviving = {}
local function startRevive(actorName, seconds)
    reviving[actorName] = { endTs = os.time() + seconds }
    setontimer(actor, 21, 1000, seconds, 0)
end
local function ontimer21(actor)
    actor = getplayerbyname(actor)
    local s = reviving[tostring(actor)]
    if s == nil then
        return
    end
    local left = s.endTs - os.time()
    if left <= 0 then
        reviving[tostring(actor)] = nil
        setontimer(actor, 21, 0, 0, 0)
        sendmsg(actor, 1, "复活！")
        beginteleport(actor, 300, 300)
        return
    end
    if left % 30 == 0 or left <= 5 then
        sendmsg(actor, 1, "复活倒计时 " .. left .. " 秒。")
    end
end

local function shouldNotify(left)
    return left <= 5 or left % 30 == 0
end