Javascript判断两个IP是否在同一网段实例代码

来源：乐娱网

avascript 判断两个IP是否在同一网段

以下脚本不做IP格式的判断，只判断两个IP是否在同一网段。

例子，Javascript判断两个IP是否在同一网段。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 
 <HEAD>
 <TITLE>
 IP段信息检测_www.manongjc.com
 </TITLE>
 <script language="JavaScript" type="text/javascript">
 function checkSameNetMask(value1, value2, netmask) {
 var ip1 = new Array();
 var ip2 = new Array();
 var nm = new Array();
 ip1 = value1.split(".");
 ip2 = value2.split(".");
 nm = netmask.split(".");
 var ip1_2s = "";
 var ip2_2s = "";
 var inm2s = "";
 var index = 0;
 for (index = 0; index < 4; index++) {
 var ip_1 = new Array();
 var ip_2 = new Array();
 var n_m = new Array();
 ip_1 = parseInt(ip1[index]).toString(2);
 ip_2 = parseInt(ip2[index]).toString(2);
 n_m = parseInt(nm[index]).toString(2);
 var tindex;
 for (tindex = 0; tindex < (8 - ip_1.length); tindex++) {
 ip1_2s += "0";
 }
 ip1_2s += ip_1;
 for (tindex = 0; tindex < (8 - ip_2.length); tindex++) {
 ip2_2s += "0";
 }
 ip2_2s += ip_2;
 for (tindex = 0; tindex < (8 - n_m.length); tindex++) {
 inm2s += "0";
 }
 inm2s += n_m;
 }
 var len = inm2s.length;
 var ip_12 = new Array();
 var ip_22 = new Array();
 var n_m_2 = new Array();
 ip_12 = ip1_2s.split("");
 ip_22 = ip2_2s.split("");
 n_m_2 = inm2s.split("");
 for (index = 0; index < len; index++) {
 if (n_m_2[index] == "1") {
 if (ip_12[index] != ip_22[index]) {
 alert("不在同一网段");
 return false;;
 }
 }
 }
 alert("在同一网段");
 return true;
 }
 </script>
 </HEAD>
 
 <BODY>
 <input name="Ip1" id="Ip1" maxlength=15>
 <br>
 <input name="Ip2" id="Ip2" maxlength=15>
 <br>
 <input name="netmask" id="netmask" maxlength=15>
 <input type="button" value="计算" onClick="checkSameNetMask( document.getElementById('Ip1').value , document.getElementById('Ip2').value , document.getElementById('netmask').value ); ">
 </BODY>
 
</HTML>