Ip校验规则：以，分割IP字符串

function isValidIp(ipStr) {
  var regEx = /,/g;
  var ipList = ipStr.replace(regEx, ',').split(',');
  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])$/;
  for (var i in ipList) {
    if (!reg.test(ipList[i])) {
        return false
    }
  }
  return true
}

var ipTest = '127.0.0.1,127.0.0.5' //true
var ipTest1 = '127.0.0.1,127.0.0.256' //false
var ipTest2 = '127.0.0.1 127.0.0.5' //false
var ipTest3 = '127.0.0.1,127.0.5' // false
var ipTest4 = '127.0.0.256,127.0.0.5' //false
var ipTest5 = '127.0.0.256,,127.0.0.5' //false
var ipTest6 = '127.0.0.252,,127.0.0.5' //false