lue反向循环

for正常循环

for i=1,10 do
    print(i)
end

for步长2循环

for i=1,10,2 do
    print(i)
end

while反向循环

i=10
while i>0 do
   i=i-1
   print(i)
end

while正常循环

i=0
while i<10 do
    i=i+1
    print(i)
end

测试地址：
http://www.runoob.com/try/runcode.php?filename=datatype1&type=lua