转的，比较完善的验证身份证号的代码
我要评论 1 /*
2 check(id)验证身份证号码
3 返回值：0 : "是正确的身份证号"
4 1 : "身份证校验不符合求和模11=1这个等式",
5 2 : "身份证最后一位校验位有误",
6 3 : "身份证位数不正确",
7 4 : "年份错误",
8 5 : "月份错误",
9 6 : "日错误"
10
11 */
12
13 function check(id) {
14 var ck = new idcard();
15 ck.check(id);
16 return ck.errnum;
17 }
18
19 function idcard(id) {
20 var me = this;
21 this.checkcode = new array(1, 0, 'x', 9, 8, 7, 6, 5, 4, 3, 2);
22 this.id;
23 this.errnum = 0;
24 this.err = {
25 1 : "身份证校验不符合求和模11=1这个等式",
26 2 : "身份证最后一位校验位有误",
27 3 : "身份证位数不正确",
28 4 : "年份错误",
29 5 : "月份错误",
30 6 : "日错误"
31 };
32 this.err_msg = function() {
33 return (0 !== this.errnum) ? this.err[this.errnum] : null;
34 };
35 this.check = function(id) {
36 this.errnum = 0;
37 this.id = id;
38 if (cardvalidate()) {
39 if (!aicheck()) this.errnum = 1;
40 if (!lastbytecheck()) this.errnum = 2;
41 return (0 === this.errnum) ? true: false;
42 } else {
43 return false;
44 }
45 };
46 function getnum(str) {
47 var re = /^[0]*([0-9]*)$/;
48 str.match(re);
49 return parseint(regexp.$1,10);
50 }
51 //对身份证位数，出生日期，初步验证
52 function cardvalidate() {
53 var re = /^[0-9x]{15,18}$/i;
54 if (!re.test(me.id)) {
55 me.errnum = 7;
56 return false;
57 }
58 if (15 == me.id.length || 18 == me.id.length) {
59 var reallen = 0;
60 if (18 == me.id.length) reallen = 2;
61 var year = parseint(me.id.substr(6, 2 + reallen),10);
62 var month = getnum(me.id.substr(8 + reallen, 2));
63 var day = parseint(me.id.substr(10 + reallen, 2),10);
64 if (4 == year.length) if (year < 1900 || year > 2050) me.errnum = 4;
65 if (month < 1 || month > 12) me.errnum = 5;
66 if (day < 1 || day > 31) me.errnum = 6;
67 return 0 === me.errnum;
68 } else {
69 me.errnum = 3;
70 return false;
71 }
72 }
73 //总和模11应该等于1
74 var aicheck = function() {
75 var sum = 0;
76 for (var i = 1; i <= me.id.length; i++) {
77 var ai = me.id.substr(me.id.length - i, 1);
78 ai = (ai.tolowercase() == 'x') ? 10 : ai;
79 var wi = math.pow(2, i - 1) % 11;
80 sum += parseint(ai,10) * wi;
81 }
82 return 1 == sum % 11;
83 };
84 //最后一位校验，这个可以和aicheck合在一起，减少一次循环
85 var lastbytecheck = function() {
86 var sum = 0;
87 for (var i = 2; i <= me.id.length; i++) {
88 var ai = me.id.substr(me.id.length - i, 1);
89 ai = (ai.tolowercase() == 'x') ? 10 : ai;
90 var wi = math.pow(2, i - 1) % 11;
91 sum += parseint(ai,10) * wi;
92 }
93 var checkcodeindex = sum % 11;
94 var c = me.id.substr(me.id.length - 1, 1);
95 //alert(c+"=="+me.checkcode[checkcodeindex]);
96 return c == me.checkcode[checkcodeindex];
97 };
98 }
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