身份证号码验证函数

function checkIDCard(s, d, g)
{
 if (!s) return false;
 d = new Date(d);
 if (!d.getTime()) return false;
 
 var t, r;
 
 t = "" + d.getFullYear() + dblNum(d.getMonth() + 1) + dblNum(d.getDate());
 
 if (g == null || isNaN(g)) return false;
 g = parseInt(g) % 2;
 
 switch (s.length)
 {
  case 8 :
   if (new Date() > d.setFullYear(d.getFullYear() + 19)) return false;
   r = /^[\d]{8}$/;
   if (!r.test(s)) return false;
   if (s != t) return false;

   break;
  case 15 :
   r = /^[\d]{15}$/;
   if (!r.test(s)) return false;
   if (s.substr(6, 6) != t.substr(2)) return false;
   if (parseInt(s.charAt(14)) % 2 != g) return false;

   break;
  case 18 :
   r = /^(?:[\d]{18}|[\d]{17}X)$/i;
   if (!r.test(s)) return false;
   if (s.substr(6, 8) != t) return false;
   if (parseInt(s.charAt(16)) % 2 != g) return false;
   
   var n = 0;
   var w = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);  // 加权因子
   var c = new Array("1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"); // 校验码
   
   for (var i = 0; i < 17; i++)
   {
    n += parseInt(s.charAt(i)) * w[i];
   }
   
   if (s.charAt(17).toUpperCase() != c[n % 11]) return false;

   break;
  default :
   return false;
 }
 
 return true;
}

function dblNum(n)
{
 return parseInt(n) < 10 ? "0" + n : n;
}

//var sss = "422324860305482";
//Response.Write(checkIDCard(sss, "03/05/1986", 0));

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