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Doc Lua callback function duoc luu trong callback property tren Instance. Doi so dau tien phai la Instance object va doi so thu hai phai la string property name. instance reference phai hop le. property name duoc resolve qua Roblox property metadata va phai tro den property co type LUA_CALLBACK. Neu thieu property descriptor, property khong phai LUA_CALLBACK, thieu callback field offset, khong co callback duoc luu, thieu LiveLuaRef, callback thuoc Lua global state khac, hoac gia tri duoc tham chieu khong phai function, function tra ve nil. No cung kiem tra async callback field fallback khi callback slot dau tien khong co callback. Function khong cap nhat property.
getcallbackvalue(instance: Instance, property: string): function | nil
getcallbackmemberlocal bindable = Instance.new("BindableFunction")
bindable.OnInvoke = function(value)
return value * 2
end
local callback = getcallbackvalue(bindable, "OnInvoke")
if callback then
print(callback(21))
end