lua打乱数组

lua实现打乱一个数组顺序

function random_array(arr)
	local tmp, index
	for i=1, #arr-1 do
		index = math.random(i, #arr)
		if i ~= index then
			tmp = arr[index]
			arr[index] = arr[i]
			arr[i] = tmp
		end
	end
end