【入门夯实】逻辑短路：and/or的执行顺序与副作用

local function tryEnter(actor)
    actor = getplayerbyname(actor)
    if inWarTime() then
        sendmsg(actor, 1, "攻城期间密道封闭。")
        return
    end
    if hasFreePass(actor) or takeitem(actor, "城主令牌", 1) then
        beginteleport(actor, 88, 96)
        sendmsg(actor, 1, "密道开启，欢迎入内。")
    else
        sendmsg(actor, 1, "进入密道需要 1 个城主令牌。")
    end
end

local function readFlag(actor, key)
    actor = getplayerbyname(actor)
    local v = getplayvar(actor, "HUMAN", key)
    if v == "" then
        return true
    end
    return v ~= 0
end