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));