javascript 判断身份证的正确性

function isIdCardNo(vals) {
var cardNum = vals;
if (cardNum.length == 0) {
return true;
}
// 11-15，21-23，31-37 ，41-46 ，50-54 ，61-65,81-82
var area = {
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"
};
var iSum = 0;
cardNum = cardNum.replace("\uff38", "X");
cardNum = cardNum.replace("x", "X");
if (!/^\d{17}(\d|x)$/i.test(cardNum)) {
alert("输入身份证号码长度不对！");
return false;
}
cardNum = cardNum.replace(/x$/i, "a");
if (area[parseInt(cardNum.substr(0, 2))] == null) {
alert("错误的身份证号码1！");
return false;
}
sBirthday = cardNum.substr(6, 4) + "-" + Number(cardNum.substr(10, 2))
+ "-" + Number(cardNum.substr(12, 2));
var d = new Date(sBirthday.replace(/-/g, "/"));
if (sBirthday != (d.getFullYear() + "-" + (d.getMonth() + 1) + "-" + d
.getDate())) {
alert("错误的身份证号码2！");
return false;
}
for ( var i = 17; i >= 0; i--) {
iSum += (Math.pow(2, i) % 11) * parseInt(cardNum.charAt(17 - i), 11);
}
if (iSum % 11 != 1) {
alert("错误的身份证号码3！");
return false;
}
return true;
};

资料惨地址  http://blog.163.com/zensys@126/blog/static/50453188200811595597/