前言

大家如果想要知道自己的年齡，出生日期和性別，或者是別人的，給我個身份證號，我就可以知道，其實很簡單的，看下面代碼。

node.js實現

static validateIdNumberToAgeYear(str){ let date = new Date(); let currentYear = date.getFullYear(); let currentMonth = date.getMonth() + 1; let currentDate = date.getDate();  let idxSexStart = str.length == 18 ? 16 : 14; let birthYearSpan = str.length == 18 ? 4 : 2; let year; let month; let day; let sex; let birthday; let age; //性別 let idxSex = 1 - str.substr(idxSexStart, 1) % 2;  sex = idxSex == '1' ? '女' : '男';  //生日 year = (birthYearSpan == 2 ? '19' : '') + str.substr(6, birthYearSpan);  month = str.substr(6 + birthYearSpan, 2);  day = str.substr(8 + birthYearSpan, 2);  birthday = year + '-' + month + '-' + day;  //年齡 let monthFloor = (currentMonth < parseInt(month,10) || (currentMonth == parseInt(month,10) && currentDate < parseInt(day,10))) ? 1 : 0; age = currentYear - parseInt(year,10) - monthFloor;  // console.log("我的出生日期是"+year+"年"+month+"月"+day+"日"+",今年"+age+"歲了"+",性別是"+sex); if(age >= 18){  return true;  }  return false;}

我這里只是做了一個年齡的判斷。

利用js也可以實現

1. 自定義js類如下:

// 構造函數，變量為15位或者18位的身份證號碼 function clsIDCard(CardNo) {  this.Valid = false;  this.ID15 = '';  this.ID18 = '';  this.Local = '';  if (CardNo != null)   this.SetCardNo(CardNo); } // 設置身份證號碼，15位或者18位 clsIDCard.prototype.SetCardNo = function(CardNo) {  this.ID15 = '';  this.ID18 = '';  this.Local = '';  CardNo = CardNo.replace(" ", "");  var strCardNo;  if (CardNo.length == 18) {   pattern = /^/d{17}(/d|x|X)$/;   if (pattern.exec(CardNo) == null)    return;   strCardNo = CardNo.toUpperCase();  } else {   pattern = /^/d{15}$/;   if (pattern.exec(CardNo) == null)    return;   strCardNo = CardNo.substr(0, 6) + '19' + CardNo.substr(6, 9)   strCardNo += this.GetVCode(strCardNo);  }  this.Valid = this.CheckValid(strCardNo); } // 校驗身份證有效性 clsIDCard.prototype.IsValid = function() {  return this.Valid; } // 返回生日字符串，格式如下，1981-10-10 clsIDCard.prototype.GetBirthDate = function() {  var BirthDate = '';  if (this.Valid)   BirthDate = this.GetBirthYear() + '-' + this.GetBirthMonth() + '-'     + this.GetBirthDay();  return BirthDate; } // 返回生日中的年，格式如下，1981 clsIDCard.prototype.GetBirthYear = function() {  var BirthYear = '';  if (this.Valid)   BirthYear = this.ID18.substr(6, 4);  return BirthYear; } // 返回生日中的月，格式如下，10 clsIDCard.prototype.GetBirthMonth = function() {  var BirthMonth = '';  if (this.Valid)   BirthMonth = this.ID18.substr(10, 2);  if (BirthMonth.charAt(0) == '0')   BirthMonth = BirthMonth.charAt(1);  return BirthMonth; } // 返回生日中的日，格式如下，10 clsIDCard.prototype.GetBirthDay = function() {  var BirthDay = '';  if (this.Valid)   BirthDay = this.ID18.substr(12, 2);  return BirthDay; } // 返回性別，1：男，0：女 clsIDCard.prototype.GetSex = function() {  var Sex = '';  if (this.Valid)   Sex = this.ID18.charAt(16) % 2;  return Sex; } // 返回15位身份證號碼 clsIDCard.prototype.Get15 = function() {  var ID15 = '';  if (this.Valid)   ID15 = this.ID15;  return ID15; } // 返回18位身份證號碼 clsIDCard.prototype.Get18 = function() {  var ID18 = '';  if (this.Valid)   ID18 = this.ID18;  return ID18; } // 返回所在省，例如：上海市、浙江省 clsIDCard.prototype.GetLocal = function() {  var Local = '';  if (this.Valid)   Local = this.Local;  return Local; } clsIDCard.prototype.GetVCode = function(CardNo17) {  var Wi = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1);  var Ai = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');  var cardNoSum = 0;  for (var i = 0; i < CardNo17.length; i++)   cardNoSum += CardNo17.charAt(i) * Wi[i];  var seq = cardNoSum % 11;  return Ai[seq]; } clsIDCard.prototype.CheckValid = function(CardNo18) {  if (this.GetVCode(CardNo18.substr(0, 17)) != CardNo18.charAt(17))   return false;  if (!this.IsDate(CardNo18.substr(6, 8)))   return false;  var aCity = {   11 : "北京",   12 : "天津",   13 : "河北",   14 : "山西",   15 : "內蒙古",   21 : "遼寧",   22 : "吉林",   23 : "黑龍江 ",   31 : "上海",   32 : "江蘇",   33 : "浙江",   34 : "安徽",   35 : "福建",   36 : "江西",   37 : "山東",   41 : "河南",   42 : "湖北 ",   43 : "湖南",   44 : "廣東",   45 : "廣西",   46 : "海南",   50 : "重慶",   51 : "四川",   52 : "貴州",   53 : "云南",   54 : "西藏 ",   61 : "陜西",   62 : "甘肅",   63 : "青海",   64 : "寧夏",   65 : "新疆",   71 : "臺灣",   81 : "香港",   82 : "澳門",   91 : "國外"  };  if (aCity[parseInt(CardNo18.substr(0, 2))] == null)   return false;  this.ID18 = CardNo18;  this.ID15 = CardNo18.substr(0, 6) + CardNo18.substr(8, 9);  this.Local = aCity[parseInt(CardNo18.substr(0, 2))];  return true; } clsIDCard.prototype.IsDate = function(strDate) {  var r = strDate.match(/^(/d{1,4})(/d{1,2})(/d{1,2})$/);  if (r == null)   return false;  var d = new Date(r[1], r[2] - 1, r[3]);  return (d.getFullYear() == r[1] && (d.getMonth() + 1) == r[2] && d    .getDate() == r[3]); }