公告轮播：多条公告定时轮换展示

-- 错误：两条公告各挂定时器，互相顶掉排期
after(5, function() showNote(1) end)
after(5, function() showNote(2) end)

local NOTES = {"维护预告", "赛事报名", "新服活动"}
local idx = 0
local label = panel:getChildByName("noteText")
local function onTick()
    if #NOTES == 0 then return end
    idx = idx % #NOTES + 1
    label:setString(NOTES[idx])
end