好友上线提醒：好友上线时的即时通知

local function onLogin(actor)
    local friends = getplayvar(actor, "friendList")
    for name in string.gmatch(friends or "", "[^|]+") do
        local f = getplayerbyname(name)
        if f ~= nil and getplayvar(f, "remindOn") == 1 then
            sendmsg(f, 1,
                getplayvar(actor, "NAME") .. " 上线了")
        end
    end
end

local function setRemind(name, on)
    local p = getplayerbyname(name)
    setplayvar(p, "remindOn", on)
    sendmsg(p, 1, on == 1 and "提醒已开启" or "提醒已关闭")
end