lua 二维数组降序取偶

array_1 = {6,68,4,77,2,9}
array_2 = {87,132,84,63}
array   = {}
a       =0

for i = 1,#array_1+#array_2 -- 合并数组
do
   
    if i < #array_1+1
    then
        array[i]=array_1[i]
    else
        a=a+1
        array[i]=array_2[a]
    end

    print(array[i])
end
print("\n")

for p = 1,#array_1-1 do   --排列数组降序排列
    for j = 1,#array-1
    do

        if array[j]