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--- @brief µ÷ÊÔʱ´òÓ¡±äÁ¿µÄÖµ
--- @param data Òª´òÓ¡µÄ×Ö·û´®
--- @param [max_level] tableÒªÕ¹¿ª´òÓ¡µÄ¼ÆÊý£¬Ä¬ÈÏnil±íʾȫ²¿Õ¹¿ª
--- @param [prefix] ÓÃÓÚÔڵݹéʱ´«µÝËõ½ø£¬¸Ã²ÎÊý²»¹©Óû§Ê¹ÓÃÓÚ
--- @ref http://dearymz.blog.163.com/blog/static/205657420089251655186/
function var_dump(data, max_level, prefix)
    if type(prefix) ~= "string" then
        prefix = ""
    end
    if type(data) ~= "table" then
        print(prefix .. tostring(data))
    else
        print(data)
        if max_level ~= 0 then
            local prefix_next = prefix .. "    "
            print(prefix .. "{")
            for k,v in pairs(data) do
                io.stdout:write(prefix_next .. k .. " = ")
                if type(v) ~= "table" or (type(max_level) == "number" and max_level <= 1) then
                    print(v)
                else
                    if max_level == nil then
                        var_dump(v, nil, prefix_next)
                    else
                        var_dump(v, max_level - 1, prefix_next)
                    end
                end
            end
            print(prefix .. "}")
        end
    end
end
function vd(data, max_level)
    var_dump(data, max_level or 5)
end

table.tostring = function(data)
	function dump(data, prefix)
		local str = tostring(data)
		local prefix_next = prefix .. "  "
		str = str .. "\n" .. prefix .. "{"
		for k,v in pairs(data) do
			str = str .. "\n" .. prefix_next .. k .. " = "
			if type(v) == "table" then
				str = str .. dump(v, prefix_next)
			else
				str = str .. tostring(v)
			end
		end
		str = str .. "\n" .. prefix .. "}"
		return str
	end
	return dump(data, "")
end