实现Cocos的handler方法

local handler = function(obj, func)
    return function(param) func(obj, param) end
end

local Myclass = {
    testFunc = function(self, param)
        print("va:")
        for k, v in pairs(param) do
            print(k)
            print(v)
        end
    end
}

local testfoo = handler(Myclass, Myclass.testFunc)

testfoo({ name = "123", value = 456})local handler = function(obj, func)
    r