Lua柯里化：参数分包的函数工厂

-- 错误：每处回调都重传同一批固定参数
btn:addClickEventListener(function()
    award("player01", 9801, 3)
end)

local function bind(fn, ...)
    local fixed = {...}
    return function(...)
        return fn(unpack(fixed), ...)
    end
end
local function award(uid, itemId, count)
    return uid .. "-" .. itemId .. "-" .. count
end
local grant = bind(award, "player01")
local label = panel:getChildByName("awardText")
label:setString(grant(9801, 3))