js 验证身份证号码
idCard.js部分
// 构造函数，变量为15位或者18位的身份证号码
function clsIDCard(CardNo) {
  this.Valid=false;
  this.ID15='';
  this.ID18='';
  this.Local='';
  if(CardNo!=null)this.SetCardNo(CardNo);
}

// 设置身份证号码，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);
}

// 校验身份证有效性
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;
}

// 返回性别，1：男，0：女
clsIDCard.prototype.GetSex = function() {
  var Sex='';
  if(this.Valid)Sex=this.ID18.charAt(16)%2;
  return Sex;
}

// 返回15位身份证号码
clsIDCard.prototype.Get15 = function() {
  var ID15='';
  if(this.Valid)ID15=this.ID15;
  return ID15;
}

// 返回18位身份证号码
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:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏 ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外"};
  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))];
&nbs