javascript：验证是否是真实有效的身份证号码函数

<input type="button" value="click" onclick='isIdCard("410456196511285935");'>

<script type="text/javascript">
/*!
* Copyright (c) 2011 sxgkwei
* Author:sxgkwei
* Email:sxgkwei@gmail.com
* Date: 2011-11-28 17:10:21
*/
var isIdCard = (function() {
var maxOld = 100;
var now = (new Date()).getFullYear();

//判断18位身份证
var is18IdCard = function(idCard) {

var year = parseInt(idCard.substring(6, 10), 10);
if (maxOld + year < now) { //证明是鬼魂
return false;
};

var idCardReg = /^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])((\d{4})|\d{3}[Xx])$/;
if (!idCardReg.test(idCard)) { //基本正则
return false;
};

var wi = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]; //权列表
var ex = [1, 0, 'x', 9, 8, 7, 6, 5, 4, 3, 2]; //校验码列表
var su = 0;
for (var i = 0, wil = wi.length; i < wil; i++) {
su += parseInt(idCard.charAt(i), 10) * wi[i];
};
return idCard.charAt(17).toLowerCase() == ex[su % 11];
};

//判断15位身份证
var is15IdCard = function(idCard) {

var maxId = 2003 - 16; //2003年前是15位证，但办证也得最少16岁吧
var minId = now - maxOld;
var year = parseInt("19" + idCard.substring(6, 8), 10);
if (minId > maxId || year < minId || year > maxId) { //证明是鬼魂或者非人类
return false;
};

var idCardReg = /^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$/;

return idCardReg.test(idCard);
};

return (function(e) {
if (e.length == 18) {
return is18IdCard(e);
} else if (e.length == 15) {
return is15IdCard(e);
} else {
alert("输入的身份证号码有误！");
return false;
};
});
})();
</script>