local function func1()
	for i = 1, 1000000 do
		local x = 1
		if i % 2 == 0 then
			x = 2
		end
	end
end

local function func2()
	local x = 1
	for i = 1, 1000000 do
		if i % 2 == 0 then
			x = 2
		end
	end
end

local t = os.clock()
func1()
print("1: " ,os.clock() - t)


t = os.clock()
func2()
print("2: " ,os.clock() - t)

os.execute("PAUSE")

-- 结果
-- 基本无差异