【进阶实战】聊天频道订阅：玩家自选频道的开关封装

local CHANNELS = { "world", "trade", "help", "chat", "war", "guild" }
local function setSub(actor, ch, on)
    actor = getplayerbyname(actor)
    local subs = getplayvar(actor, "HUMAN", "ChSub") or "111111"
    local idx = 0
    for i, c in ipairs(CHANNELS) do
        if c == ch then
            idx = i
        end
    end
    if idx == 0 then
        return false
    end
    local bits = {}
    for i = 1, 6 do
        bits[i] = (i == idx) and (on and "1" or "0")
            or string.sub(subs, i, i)
    end
    setplayvar(actor, "HUMAN", "ChSub", table.concat(bits), 1)
    return true
end
local function subscribed(actor, ch)
    actor = getplayerbyname(actor)
    local subs = getplayvar(actor, "HUMAN", "ChSub") or "111111"
    local idx = 0
    for i, c in ipairs(CHANNELS) do
        if c == ch then
            idx = i
        end
    end
    return string.sub(subs, idx, idx) == "1"
end

local function pushChat(actor, ch, text)
    if subscribed(actor, ch) then
        sendmsg(actor, 1, text)
    end
end