IPV6专题（三）
本节主要说明下IPV4到IPV6的转换：
IPV4到IPV6网址的转换很简单，只需将IPV4地址转为十六进制格式，以两段为一组，然后再前面添加::ffff即可
JS代码如下：
function four2six(fouraddr,fourmask)//IPV4转IPV6，包括地址和掩码{var reg = fouraddr.match(/^(\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])$/);if(reg==null){alert("IP地址不正确!");return;}if(fourmask.indexOf(".")!=-1){reg = fourmask.match(/^(254|252|248|240|224|192|128|0)\.0\.0\.0$|^(255\.(254|252|248|240|224|192|128|0)\.0\.0)$|^(255\.255\.(254|252|248|240|224|192|128|0)\.0)$|^(255\.255\.255\.(255|254|252|248|240|224|192|128|0))$/);if(reg==null){alert("子网掩码不正确!");return;}}else{var mask = parseInt(fourmask, 10);if(mask<0 || mask > 32){alert("子网掩码不正确!");return;}}/***IPV4转IPV6的方法很简单1、先将其每段转为16进制2、不足两位的前面添加03、V4一共会产生4个16进制数字，比前两个和后两个分别组合4、地址前面加上"0000:0000:0000:0000:0000:ffff:"即可**/var sixtemp = "";var fouraddrs = fouraddr.split(".");for (var i=0; i<fouraddrs.length; i++){var addr4ip = parseInt(fouraddrs[i], 10);var addrtemp = addr4ip.toString(16);if(addrtemp.length==1){addrtemp = "0" + addrtemp;}sixtemp += addrtemp;if(i==1){sixtemp += ":";}}//以上产生V6地址段正确sixtemp = "0000:0000:0000:0000:0000:ffff:" + sixtemp;/***下面处理子网掩码，子网掩码可以有两种写法,数字或者255.255.255.0写法1、第一种处理比较简单，只需此数值加96（128-32）即可2、第二种需要分为四段，每段转为2进制，看哪一位最开始变为0**/var masktemp = 96;if(fourmask.indexOf(".")==-1){masktemp += parseInt(fourmask);}else{var masks = fourmask.split(".");for ( var i=0; i<masks.length; i++){var mask4ip = parseInt(masks[i], 10);var mask4temp = mask4ip.toString(2);if(mask4temp.length!=8){for(var j=0;j<8-mask4temp;j++){mask4temp = "0"+mask4temp;}}//下面判断位置var flagtemp = false;for(var j=0;j<8;j++){if(mask4temp.charAt(j)=='0'){flagtemp = true;masktemp += i*8 + j;break;}if(j==7&&i==3){flagtemp = true;masktemp = 128;break;}}if(flagtemp){break;}}}return sixtemp + "/" + masktemp;}function four2sixip(fouraddr)//IPV4转IPV6，只转地址{var reg = fouraddr.match(/^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/);if(reg==null){alert("IP地址不正确!");return;}var sixtemp = "";var fouraddrs = fouraddr.split(".");for (var i=0; i<fouraddrs.length; i++){var addr4ip = parseInt(fouraddrs[i], 10);var addrtemp = addr4ip.toString(16);if(addrtemp.length==1){addrtemp = "0" + addrtemp;}sixtemp += addrtemp;if(i==1){sixtemp += ":";}}//以上产生V6地址段正确sixtemp = "0000:0000:0000:0000:0000:ffff:" + sixtemp;return sixtemp;}