【入门夯实】函数作为值：回调注册的名字冲突

local handlers = {}
handlers["login"] = checkBuff
handlers["login"] = sendWelcome

local handlers = {}
local function on(event, fn)
    local list = handlers[event]
    if list == nil then
        list = {}
        handlers[event] = list
    end
    list[#list + 1] = fn
end
local function fire(actor, event)
    local list = handlers[event]
    if list == nil then
        return
    end
    for _, fn in ipairs(list) do
        fn(actor)
    end
end
on("login", checkBuff)
on("login", sendWelcome)

local function dispatch(fnList, arg)
    for _, fn in ipairs(fnList) do
        local ok, err = pcall(fn, arg)
        if not ok then
            sendmsg(nil, 1, "回调异常：" .. tostring(err))
        end
    end
end