验证15位或18位身份证号，带X

编写一个card.js
  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:"雲南",
   54:"西藏",61:"陝西",62:"甘肅",63:"青海",64:"寧夏",65:"新疆",71:"臺灣",81:"香港",82:"澳門",91:"國外"} ;    

function isIdCardNo(sId)
{
   var iSum=0 ;   
   var info=''  ; 
   var result = new Array() ;      
   if(sId.length!=15 && sId.length!=18)  
   {        
   result[0] = false ;       
   result[1] = "身份证号码长度错误";       
   return result;  
   }      
 
  if(sId.length==15)   
  {
  //15位身份證驗證       
  if (isNaN(sId))       
  {           
  result[0] = false ;           
  result[1] = "身份证号码格式错误";           
  return result;        
  }               
 
  if(aCity[parseInt(sId.substr(0,2))]==null)       
  {           
  result[0] = false ;           
  result[1] = "非法地区";           
  return result ;       
  }       
 
  var sBirthday="19"+sId.substr(6,2)+"-"+Number(sId.substr(8,2))+"-"+Number(sId.substr(10,2));        
  var d=new Date(sBirthday.replace(/-/g,"/")) ;       
  if(sBirthday!=(d.getFullYear()+"-"+ (d.getMonth()+1) + "-" + d.getDate()))      
  {           
  result[0] = false ;           
  result[1] = "非法生日";            
  return result ;        
  }  
  }  
  else  
  {
  //18位身份證驗證         
  if(!/^\d{17}(\d|x)$/i.test(sId))       
  {           
  result[0] = false ;           
  result[1] = "非身份证号码";           
  return result;        
  }       
  sId=sId.replace(/x$/i,"a");        
  if(aCity[parseInt(sId.substr(0,2))]==null)       
  {           
  result[0] = false ;           
  result[1] = "非法地区";           
  return result ;       
  }       
  var sBirthday=sId.substr(6,4)+"-"+Number(sId.substr(10,2))+"-"+Number(sId.substr(12,2));        
      var d=new Date(sBirthday.replace(/-/g,"/")) ;       
  if(sBirthday!=(d.getFullYear()+"-"+ (d.getMonth()+1) + "-" + d.getDate()))
  {           
  result[0] = false ;           
  result[1] = "非法生日";            
  return result ;        
  }       
  for(var i = 17;i>=0;i --)
  iSum += (Math.pow(2,i) % 11) * parseInt(sId.charAt(17 - i),11) ;       
  if(iSum%11!=1)       
  {           
  result[0] = false ;           
  result[1] = "非法证号";           
  return result ;        
  }   
   }     
result[0] = true ;          
var Sex_Flag = (sId.length==15) ?  sId.substr(14,1) : sId.substr(16,1); //男性為奇數，女性為偶數    
result[1] = "合法证件\r\n\r\n证件基本信息为："+aCity[parseInt(sId.substr(0,2))]+","+sBirthday+","+(Sex_Flag%2?"男":"女") ;                 
return result ;
}

jsp界面：
function checkResult(w)
{   
  var sId = w.value ;   
  if(sId != "")   
  {       
  var result = isIdCardNo(sId);                
  if(result[0] == false )       
  {              
  alert(result[1]);
  $("#age").val('');
  $("#birthday").val('');
  w.focus();      
  }       
  else       
          {
//真正使用時，屏蔽掉該分支即可           
alert(result[1]);   
  }   
    }   
} 

<input name="user.identifyCard" id="identifyCard"  onblur="checkResult(this)">