Javascript 判斷兩個IP是否在同一網段
以下腳本不做IP格式的判斷，只判斷兩個IP是否在同一網段。
例子，Javascript判斷兩個IP是否在同一網段。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML> <HEAD> <TITLE> IP段信息檢測_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("不在同一網段"); return false;; } } } alert("在同一網段"); 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="計算" onClick="checkSameNetMask( document.getElementById('Ip1').value , document.getElementById('Ip2').value , document.getElementById('netmask').value ); "> </BODY></HTML>需要的朋友可以拿去參考。感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
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