ruby中的sort方法，这个方法可以加一个两个参数的block，这个block可以返回1 0 -1来表示这两个参数大于 等于 小于
示例：
str = ["192.160.175","192.160.90","192.168.2.175","192.168.2.90","192.168.1.180","192.160.90.1"]
arr = str.sort do |a, b|
ip1 = a.split('.').map &:to_i
ip2 = b.split('.').map &:to_i
ret = 0
ip1.each_with_index do |ip, i|
if ip2[i].nil?
ret = 1
break
end
if ip != ip2[i]
ret = ip <=> ip2[i]
break
end
end
ret = ret == 0 && ip1.size > ip2.size ? 1 : ret
end
p arr
输出：
["192.160.90","192.160.175","192.160.90.1","192.168.1.180","192.168.2.90","192.168.2.175"]
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