【Lua实战】检查点留存：长流程任务的中断续跑

-- 检查点留存：写入检查点
local player = class(actor)
local CHECKPOINTS = {3, 6, 9}
local function saveCheckpoint(player, stepNo, itemCnt)
    local reached = false
    for _, cp in ipairs(CHECKPOINTS) do
        if stepNo == cp then reached = true end
    end
    if not reached then return end
    setplayvar(player, "HUMAN", "QuestCp", stepNo, true)
    setplayvar(player, "HUMAN", "QuestCpItem", itemCnt, true)
    sendmsg(player, 1, 0, "任务进度已保存：第 " .. stepNo .. " 步。")
end

-- 断点续跑：恢复与清除
local player = class(actor)
local function resumeQuest(player)
    local cp = tonumber(getplayvar(player, "HUMAN", "QuestCp") or 0)
    if cp == 0 then
        sendmsg(player, 1, 0, "从第一步开始。")
        return 1, 0
    end
    local itemCnt = tonumber(getplayvar(player, "HUMAN", "QuestCpItem") or 0)
    sendmsg(player, 1, 0, "从第 " .. cp .. " 步继续，已收集材料 " .. itemCnt .. " 个。")
    setplayvar(player, "HUMAN", "QuestCp", 0, true)
    setplayvar(player, "HUMAN", "QuestCpItem", 0, true)
    return cp + 1, itemCnt
end