Javascript 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。

<code class="html">

  
  
    <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>
  
  
  
    <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 ); ">
  

</code>

需要的码农可以拿去参考。