本文共 2743 字，大约阅读时间需要 9 分钟。

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--根据type和id生成一个唯一的索引 local function generateIndex( ty,id )    	assert(type(ty) == "number")    	assert(type(id) == "number")    	return ty * 1000000 + id    end    local function ungenerateIndex( index )    	local ty = math.modf( index / 1000000 )  -- 取整数    	local id = math.fmod( index, 1000000 )    -- 取余数    	return ty,id    end        --合并奖励    function mergeDropAward(awards)    	assert(type(awards) == "table")    	if #awards <= 1 then return awards end    	-- 合并    	local temp = {
   }    	local tempx = {
   }    	local pos = 0    	for _, award in ipairs(awards) do    		assert(type(award) == "table")    		local index = generateIndex( award.type,award.id )    		local p = temp[index]    		if p then    			local re = tempx[p]    			re.count = re.count + award.count    		else    			table.insert(tempx,{
   type = award.type,id = award.id,count = award.count})    			pos = pos + 1    			temp[index] = pos    		end    	end        	return tempx    end        local awards =     {
       	{
   type = 1,id = 1,count = 10},    	{
   type = 2,id = 1,count = 10},    	{
   type = 1,id = 1,count = 10},    	{
   type = 4,id = 1,count = 10},    	{
   type = 4,id = 1,count = 10},    	{
   type = 1,id = 1,count = 10},    }        local rewards = mergeDropAward(awards)        for _,v in ipairs(rewards) do    	print(v.type,v.id,v.count)    end

当然还有一种更巧妙的方式来实现同类物品合并，那就是元表，下面就用元表来实现以下

local function _copyTable(s, t)	for k, v in pairs(s) do		if type(v) == "table" then			t[k] = {
   }			_copyTable(v, t[k])		else			t[k] = v		end	endendfunction copyTable(s)	if type(s) ~= "table" then return s end	local t = {
   }	_copyTable(s, t)	return tendfunction getArrayPlus(addKey)	local pluskey = addKey    local recordkey = {
   }    local function _GetTick(tb)    	local tick = {
   }    	for k, v in pairs(tb) do    		if k ~= pluskey then    			table.insert(tick, v)    		end    	end        return table.concat(tick, ".")    end    local function _Merger(sourceTb, newTb)    	for __,v in pairs(newTb) do    		if type(v) == "table" then    			_Merger(sourceTb, v)    		else    			local tick = _GetTick(newTb)     			local index = recordkey[tick]    			if index then    				sourceTb[index][pluskey] = sourceTb[index][pluskey] + newTb[pluskey]    			else    				table.insert(sourceTb, copyTable(newTb))    				recordkey[tick] = #sourceTb    			end    			break    		end    	end    end    local operateTb = setmetatable({
   }, {
   __add = function(sourceTb, addTb)    	addTb = addTb or {
   }    	_Merger(sourceTb, addTb)    	return sourceTb    end})    return operateTbendlocal addtab = getArrayPlus("count") for _,v in ipairs(rewardslist) do	addtab = addtab + vendfor _,v in ipairs(addtab) do	print(v.type,v.id,v.count)end

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