JS Identification method Support 15-bit and 18-bit

  This article mainly introduces the JS identification method to support 15-bit and 18-bit, the need for friends can refer to the following

The code is as follows: The//html page should have an input input box with an ID of Identity_card, a ipmessage ID error or a message where it is correct   <script> //ID card Verification   $ (document). Ready (function () {  $ ("#identity_card"). Change (function () {  var idcard =$ (This). Val ();   Checkdate (Idcard); }); }); //ID   function checkdate (idcard) {  var socialno = Idcard ;  if (Socialno = = "")   {  $ (' #ipmessage '). HTML (' Enter the ID number format incorrectly, must be 15 to 18-bit ID number ');  alert (" Enter ID number cannot be empty! ");   Return (false); }  if (socialno.length!= && socialno.length!=)   {  $ (' #ipmessa GE '). html (' input ID number format is not correct, must be 15 to 18-bit ID number ');  alert ("Input ID number format incorrect!");   Return (false); }  var area={11: "Beijing", 12: "Tianjin", 13: "Hebei", 14: "Shanxi", 15: "Inner Mongolia", 21: "Liaoning", 22: "Jilin", 23: "Heilongjiang", 31 : "Shanghai", 32: "Jiangsu", 33: "Zhejiang", 34: "Anhui", 35: "Fujian", 36: "Jiangxi", 37: "Shandong", 41: "Henan", 42: "Hubei", 43: "Hunan", 44: "Guangdong", 45: "Guangxi", 46: "Hainan", 50: "Chongqing", 51: "Sichuan", 52: "Guizhou", 53: "Yunnan", 54: "Tibet", 61: "Shaanxi", 62: "Gansu", 63: "Qinghai", 64: "Ningxia", 65: "Xinjiang", 71: "Taiwan", 81: "Hong Kong", 82: "Macao", 91: "Foreign"};  if (Area[parseint (Socialno.substr (0,2))]==null) {  $ (' #ipmessage '). HTML (' input ID number format incorrect, must be 15 to 18-bit ID number ');   Alert ("Incorrect ID number (illegal area)");   Return (false); }  if (socialno.length =)   {  pattern=/^d{15}$/;  if (pattern.exec (s Ocialno) ==null) {  $ (' #ipmessage '). HTML (' input ID number format is incorrect, must be 15 to 18-bit ID number ');  alert ("15 ID number must be number!") ");  return (false); }  var birth = parseint (" + socialno.substr (6,2));  var month = Socialno.subs TR (8,2);  var day = parseint (Socialno.substr (10,2));  switch (month) {  case ' the ':  case ':  C ASE ':  case ' a ':  case ' in ':  case ' a ':  case ':  $ (' #ipmessage '). HTML (' input ID number format is not correct, must be 15 to 18-bit ID number ');  alert (' Input ID number not formatted correctly! ');   Return false; }  break;  case ':  ' the case ':  ' the case ':  ' the case ' one ':  if (day >30) {  $ (' #ipmessage '). HTML (' input ID number format incorrect, must be 15 to 18-bit ID number ');  alERT (' Input ID number is not properly formatted! ');   Return false; }  break;  case ':  if (birth% 4 = 0 && Birth%!= 0) | | birth % = = 0) {  if (day>29) {  $ (' #ipmessage '). HTML (' Enter the ID number format incorrectly, must be 15 to 18-bit ID number ');  alert (' Input ID number not formatted correctly! ');   return false; } } else {  if (day>28) {  $ (' #ipmessage '). HTML (' input ID number is not in the correct format, Must be 15 to 18-bit ID number ');  alert (' Input ID number not formatted correctly! ');   return false; } }  break;  default:  $ (' #ipmessage '). HTML (' input ID number is not in the correct format, Must be 15 to 18-bit ID number ');  alert (' Input ID number not formatted correctly! ');   return false; }  var nowyear = new Date (). getyear ();  if (Nowyear-parseint (birth) <15 | | nowyear -parseint (birth) >100) {  $ (' #ipmessage '). HTML (' input ID number format incorrect, must be 15 to 18-bit ID number ');  alert (' Input ID number not formatted correctly! ');   Return false; }  $ (' #ipmessage '). HTML (' Pass! ');  return (true); }  var Wi = new Array (  7,9,10,5,8,4,2,1,6,  3,7,9,10,5,8,4,2,1 ); &nb Sp; var lsum = 0;  var nnum = 0;  var nchecksum = 0;  for (i = 0; i < ++i)   {  if (socialno.c Harat (i) < ' 0 ' | | Socialno.charat (i) > ' 9 ')   {  $ (' #ipmessage '). HTML (' Enter the ID number format incorrectly, must be 15 to 18-bit ID number ');  alert (" Input ID number format is not correct! ");   Return (false); }  else  {  nnum = Socialno.charat (i)-' 0 '; }  lsum + + nnum * wi[i ]; }  if (socialno.charat) = = ' X ' | | Socialno.charat (+) = ' x ')   {  lsum = 10*wi[17]; }&nb Sp else if (Socialno.charat < ' 0 ' | | socialno.charat (s) > ' 9 ')   {  $ (' #ipmessage '). HTML (' input ID number format is incorrect, Must be 15 to 18-bit ID number ');  alert ("Input ID number format is not correct!");   Return (false); }  else  {  lsum + + (socialno.charat)-' 0 ') * wi[17]; }  if ( (lsum%) = = 1)   {  $ (' #ipmessage '). HTML (' Pass! ');  return true; }  else  {  $ (' #ipmessage '). HTML (' input ID number format is incorrect, must be 15 to 18-bit ID number ');  Alert ("Enter the ID numberCode format is not correct! ");   Return (false); } }  </script>