1.验证方法
function isValidIP(ip) { var reg = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/ return reg.test(ip); }
2.判断
isValidIP(NewIP) == false
原文：http://www.cnblogs.com/xinyibufang/p/7245950.html