【进阶实战】浏览历史：寄售行浏览记录的留存与清理封装

local function recordView(actor, goodsId)
    actor = getplayerbyname(actor)
    local list = getplayvar(actor, "HUMAN", "ViewHis") or ""
    local entries, found = {}, false
    for e in string.gmatch(list, "[^|]+") do
        local gid = string.match(e, "([^:]+):")
        if gid == goodsId then
            found = true
        else
            entries[#entries + 1] = e
        end
    end
    if not found and #entries >= 20 then
        table.remove(entries, 1)
    end
    entries[#entries + 1] = goodsId .. ":" .. os.time()
    setplayvar(actor, "HUMAN", "ViewHis", table.concat(entries, "|"), 1)
end

local function showHistory(actor)
    actor = getplayerbyname(actor)
    local list = getplayvar(actor, "HUMAN", "ViewHis") or ""
    local shown = 0
    for e in string.gmatch(list, "[^|]+") do
        local gid, at = string.match(e, "([^:]+):(%d+)")
        if os.time() - tonumber(at) <= 3 * 86400 then
            shown = shown + 1
            sendmsg(actor, 1, shown .. ". 商品 " .. gid)
        end
    end
    if shown == 0 then
        sendmsg(actor, 1, "近 3 天没有浏览记录。")
    end
end