table.sort(test)

table.sort(test, function(a,b) return a.idb.id end )

local test0 ={1,9,2,8,3,7,4,6}

table.sort(test0)  --从小到大排序
for i,v in pairs(test0) do
   io.write(v.." ")
end
print("");

table.sort(test0,function(a,b) return a>b end) --从大到小排序
for i,v in pairs(test0) do
   io.write(v.." ")
end
print(" ")

local test2 ={
                {id=1, name="deng"},
                {id=9, name="luo"},
                {id=2, name="yang"},
                {id=8, name="ma"},
                {id=5, name="wu"},
}

table.sort(test2,function(a,b) return a.idb.id end )
for i in pairs(test2) do
   print(test2[i].id,test2[i].name)
end

local test1 ={a=1,f=9,d=2,c=8,b=5}

local key_test ={}
for i in pairs(test1) do
   table.insert(key_test,i)   --提取test1中的键值插入到key_test表中
end

table.sort(key_test)
for i,v in pairs(key_test) do
   print(v,test1[v])
end