/* ****************** *//* 判斷IP地址是否合法 */var judgeIpIsLegal = function(ipAddr){  var regIps = /^(((25[0-5]|2[0-4]/d|1/d{2}|[1-9]/d|[0-9])/.){3}(25[0-5]|2[0-4]/d|1/d{2}|[1-9]/d|[0-9]))$/;  return regIps.test(ipAddr);}/* IP地址轉換為二進制字符串 *//* 例如：172.16.4.235 --> 10101100000100000000010011101011 */var praseIpToBinary = function(ipAddress){  var numArray = ipAddress.split(".");  if(numArray.length != 4){    alert("輸入的IP有誤");    return;  }  var returnIpStr = "";  for (var i = 0; i < 4; i++) {    var curr_num = numArray[i];    var number_Bin = parseInt(curr_num);    number_Bin = number_Bin.toString(2);    var iCount = 8-number_Bin.length;    for (var j = 0; j < iCount; j++) {      number_Bin = "0"+number_Bin;    }    returnIpStr += number_Bin;  }  return returnIpStr;}/* 判斷子網掩碼是否合法 *//* 子網掩碼必須是 1 和 0組成的連續的一段 如 11110000 */var judgeSubnetMask = function(ipAddress){  var binaryIpString = praseIpToBinary(ipAddress).toString();  var subIndex = binaryIpString.lastIndexOf("1")+1;  var frontHalf = binaryIpString.substring(0,subIndex);  var backHalf = binaryIpString.substring(subIndex);  if(frontHalf.indexOf("0") != -1 || backHalf.indexOf("1") != -1){    return false;  }else{    return true;  }}/* 兩個IP地址做 與 操作 返回結果 *//* 該功能主要用來實現 IP地址和子網掩碼 相與，獲取當前IP地址的IP地址段 *//* 以此來驗證輸入的網關地址是否合法 */var getIPsAndResult = function(ipAddr1,ipAddr2){  var ipArray1 = ipAddr1.split(".");  var ipArray2 = ipAddr2.split(".");  var returnResult = "";  if(ipArray1.length != 4 || ipArray2.length != 4 ){    alert("輸入的IP有誤");    return;  }  for (var i = 0; i < 4; i++) {    var number1 = parseInt(ipArray1[i]);    var number2 = parseInt(ipArray2[i]);    returnResult += number1&number2;    if(i<3){      returnResult += ".";    }  }  return returnResult;}/* 判斷網關地址是否合法 */var judgeGatewayResult = function(ipAddr,subnetMask,gateway){  var andResult1 = getIPsAndResult(ipAddr,subnetMask);  var andResult2 = getIPsAndResult(gateway,subnetMask);  if(andResult1 == andResult2){    return true;  }else{    return false;  }}