Javascript 判断域名合法性，JS域名格式检测
今天在看阿里云的源码的时候，发现一个 JS 不错，能解决一些问题，分享出来。其实域名没法很好的判断，因为后缀不确定，不断的增加。所以能完美的判断还是得不断的更新。
Javascript 域名判断源码
function DomainParser(domainName) {
var input = domainName;
var modifyName = domainName;
var b_error = false;
var message = "";
DomainParser.prototype.parse = function() {
if (!input || input.length==0) {
failMessage('请填写域名，例如：sojson.com');
return;
}
var labels = parseLabels();
if (hasError()) {
return;
}
if (labels.length==1) {
failMessage('域名格式错误。请输入正确的域名格式，以“.”进行区分 ');
return;
}
var topLabel = labels[labels.length-1];
if (isDigitLabels(topLabel)) {
failMessage("域名格式错误。请输入正确的域名格式，以“.”进行区分 ");
return ;
}
if (input.length>255) {
failMessage('域名过长。每标号不得超过63个字符。由多个标号组成的完整域名总共不超过255个字符。');
return;
}
var topLevel = parseTopLevel(labels);
if (topLevel.labelIndex==0) {
failMessage(topLevel.name+'是域名后缀，不能查询。');
return;
}
var secondLevel = parseSecondLevel(labels,topLevel);
if (secondLevel.labelIndex!=0 && topLevel.recognized) {
modifyName = secondLevel.name +"."+ topLevel.name;
}
}
DomainParser.prototype.getModifyName = function() {
return modifyName;
}
function hasError() {
return b_error;
}
DomainParser.prototype.hasError = hasError;
DomainParser.prototype.getMessage = function() {
if (hasError()) {
return message;
}
else {
return null;
}
}
function parseLabels() {
var labels = new Array();
var offset = 0;
while (offset< input.length) {
var label = parseLabel();
if (!hasError() && label) {
labels.push(label);
}
else {
return;
}
}
return labels;
function parseLabel() {
var labelArr = new Array();
var start = offset;
while (offset < input.length) {
var ch = input.charAt(offset);
var invalid = false;
if (start==offset && !isLetterOrDigit(ch)) {
invalid = true;
}
else if ((offset+1==input.length || input.charAt(offset+1)=='.') && !isLetterOrDigit(ch)) {
invalid = true;
}
else if (!isLabelChar(ch)){
invalid = true;
}
if (invalid) {
failMessage('格式错误。域名一般由英文字母、汉字、阿拉伯数字、"-"组成，用“.”分隔，且每段不能以“.”、"-”开头和结尾');
return;
}
else {
labelArr.push(ch);
offset++;
if ((offset<input.length && input.charAt(offset)=='.') || (offset==input.length) ) {
if (offset<input.length && input.charAt(offset)=='.') {
offset++;
}
if (labelArr.length>63) {
failMessage('域名过长。每标号不得超过63个字符。由多个标号组成的完整域名总共不超过255个字符。');
return;
}
return labelArr.join("");
}
}
}
}
}
function isLabelChar(ch) {
if (ch.charCodeAt(0)<=127) {
if( (ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z') || (ch>='0'&&ch<='9') || (ch=='-') ) {
return true;
}
else {
return false;
}
}
else {
if ((ch.charCodeAt(0)>=0xFF00 && ch.charCodeAt(0)<=0xFFEF) ||
(ch.charCodeAt(0)>=0x3000 && ch.charCodeAt(0)<=0x303F)
) {
return false;
}
else {
return true;
}
}
}
function isLetterOrDigit(ch) {
if (ch.charCodeAt(0)<=127) {
if( (ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z') || (ch>='0'&&ch<='9') ) {
return true;
}
else {
return false;
}
}
else {
if ((ch.charCodeAt(0)>=0xFF00 && ch.charCodeAt(0)<=0xFFEF) ||
(ch.charCodeAt(0)>=0x3000 && ch.charCodeAt(0)<=0x303F)
) {
return false;
}
else {
return true;
}
}
}
function isDigitLabels(label) {
var i = 0;
while (i<label.length) {
var ch = label.charAt(i);
if (!(ch>='0'&& ch<='9')) {
return false;
}
i++;
}
return true;
}
function parseTopLevel(labels) {
var topLevelName = "";
var lowTopLevelName = "";
var topLevel;
var index;
if (labels.length>=2) {
topLevelName = labels[labels.length-2]+"."+labels[labels.length-1];
lowTopLevelName = topLevelName.toLowerCase();
for (index=0;index<tow_top_level.length;index++) {
if (lowTopLevelName==tow_top_level[index]) {
topLevel = new TopLevel(topLevelName,2,labels.length-2,true);
break;
}
}
}
if (!topLevel) {
topLevelName = labels[labels.length-1];
lowTopLevelName = topLevelName.toLowerCase();
for (index=0;index<one_top_level.length;index++) {
if (lowTopLevelName==one_top_level[index]) {
topLevel = new TopLevel(topLevelName,1,labels.length-1,true);
break;
}
}
}
if (!topLevel) {
topLevelName = labels[labels.length-1];
topLevel = new TopLevel(topLevelName,1,labels.length-1,false);
}
return topLevel;
}
function TopLevel(name,labelCount,labelIndex,recognized) {
this.name = name;
this.labelCount= labelCount;
this.labelIndex= labelIndex;
this.recognized = recognized;
return this;
}
function parseSecondLevel(labels,topLevel) {
var secondLevel = new SecondLevel(labels[topLevel.labelIndex-1],1,topLevel.labelIndex-1);
return secondLevel;
}
function SecondLevel(name,labelCount,labelIndex) {
this.name = name;
this.labelCount=labelCount;
this.labelIndex = labelIndex;
return this;
}
function failMessage(msg) {
message = msg;
b_error = true;
}
var one_top_level = ['ac','ad','ae','aero','af','ag','ai','al','am','an','ao','aq',
'ar','arpa','as','asia','at','au','aw','ax','az','ba','bb','bd',
'be','bf','bg','bh','bi','biz','bj','bl','bm','bn','bo','bq',
'br','bs','bt','bv','bw','by','bz','ca','cat','cc','cd','cf',
'cg','ch','ci','ck','cl','cm','cn','co','com','coop','cr','cu',
'cv','cw','cx','cy','cz','de','dj','dk','dm','do','dz','ec',
'edu','ee','eg','eh','er','es','et','eu','fi','fj','fk','fm',
'fo','fr','ga','gb','gd','ge','gf','gg','gh','gi','gl','gm',
'gn','gov','gp','gq','gr','gs','gt','gu','gw','gy','hk','hm',
'hn','hr','ht','hu','id','ie','il','im','in','info','int',
'io','iq','ir','is','it','je','jm','jo','jobs','jp','ke',
'kg','kh','ki','km','kn','kp','kr','kw','ky','kz','la',
'lb','lc','li','lk','lr','ls','lt','lu','lv','ly','ma','mc',
'md','me','mf','mg','mh','mil','mk','ml','mm','mn','mo',
'mobi','mp','mq','mr','ms','mt','mu','museum','mv','mw',
'mx','my','mz','na','name','nc','ne','net','nf','ng',
'ni','nl','no','np','nr','nu','nz','om','org','pa',
'pe','pf','pg','ph','pk','pl','pm','pn','post','pr',
'pro','ps','pt','pw','py','qa','re','ro','rs','ru',
'rw','sa','sb','sc','sd','se','sg','sh','si','sj',
'sk','sl','sm','sn','so','sr','ss','st','su','sv','sx',
'sy','sz','tc','td','tel','tf','tg','th','tj','tk','tl',
'tm','tn','to','tp','tr','travel','tt','tv','tw','tz',
'ua','ug','uk','um','us','uy','uz','va','vc','ve','vg',
'vi','vn','vu','wf','ws','中国','中國','香港','台湾','台灣',
'新加坡','xxx','ye','yt','za','zm','zw','zw','xn--fiqs8s',
'xn--fiqz9s','xn--j6w193g','xn--kprw13d','xn--kpry57d',
'xn--yfro4i67o','公司','网络','網絡','xn--55qx5d','xn--io0a7i'];
var tow_top_level = ['ac.cn','com.cn','edu.cn','gov.cn','mil.cn','net.cn','org.cn','bj.cn',
'sh.cn','tj.cn','cq.cn','he.cn','sx.cn','nm.cn','ln.cn','jl.cn',
'hl.cn','js.cn','zj.cn','ah.cn','fj.cn','jx.cn','sd.cn','ha.cn',
'hb.cn','hn.cn','gd.cn','gx.cn','hi.cn','sc.cn','gz.cn','yn.cn',
'xz.cn','sn.cn','gs.cn','qh.cn','nx.cn','xj.cn','tw.cn','hk.cn',
'mo.cn','com.af','net.af','org.af','com.ag','net.ag','org.ag','co.at',
'or.at','com.bi','edu.bi','info.bi','mo.bi','or.bi','org.bi','com.br',
'net.br','org.br','co.bz','com.bz','net.bz','org.bz','co.cm','com.cm',
'net.cm','com.co','net.co','nom.co','ar.com','br.com','cn.com','de.com',
'eu.com','gb.com','gr.com','hu.com','jpn.com','kr.com','no.com',
'ru.com','se.com','uk.com','us.com','za.com','com.de','co.dm','com.ec',
'fin.ec','info.ec','med.ec','net.ec','pro.ec','com.es','nom.es',
'org.es','co.gg','net.gg','org.gg','co.gl','com.gl','edu.gl','net.gl',
'org.gl','com.gr','co.gy','com.gy','net.gy','com.hk','edu.hk','gov.hk',
'idv.hk','net.hk','org.hk','com.hn','net.hn','org.hn','adult.ht','com.ht',
'info.ht','net.ht','org.ht','org.il','co.in','firm.in','gen.in','ind.in',
'net.in','org.in','bz.it','co.it','co.je','net.je','org.je','com.ki',
'net.ki','org.ki','co.kr','ne.kr','or.kr','pe.kr','re.kr','seoul.kr',
'com.lc','net.lc','org.lc','co.mg','com.mg','net.mg','org.mg','ac.mu',
'co.mu','com.mu','net.mu','org.mu','com.mx','gb.net','hu.net','jp.net',
'se.net','uk.net','com.nf','net.nf','org.nf','co.nl','net.nz','org.nz',
'ae.org','us.org','com.pe','net.pe','org.pe','com.ph','com.pk','net.pk',
'org.pk','biz.pl','com.pl','info.pl','net.pl','org.pl','waw.pl','aaa.pro',
'aca.pro','acct.pro','avocat.pro','bar.pro','cpa.pro','eng.pro','jur.pro',
'law.pro','med.pro','recht.pro','com.ps','net.ps','org.ps','com.pt','edu.pt',
'org.pt','com.ru','net.sb','org.sb','com.sc','net.sc','org.sc','com.sg',
'com.so','net.so','org.so','club.tw','com.tw','ebiz.tw','game.tw','idv.tw',
'org.tw','me.uk','org.uk','co.uz','com.uz','com.vc','net.vc','org.vc',
'ac.vn','biz.vn','com.vn','edu.vn','gov.vn','health.vn','info.vn','int.vn',
'name.vn','net.vn','org.vn','pro.vn'];
}最后一段就是域名后缀，要判断的更新，不过也不是那么快更新。
Javascript 域名判断使用方法
var domain ="sojson.com";
var parser = new DomainParser(domain);
//解析
parser.parse();
//判断是否正常
if (parser.hasError()) {
//错误信息
var msg = parser.getMessage();
return;
}
//获取域名
domain = encodeURI(parser.getModifyName());可以试试，我已经纳入到本站判断。
版权所属：SO JSON在线解析
原文地址：https://www.sojson.com/blog/312.html
转载时必须以链接形式注明原始出处及本声明。
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