1 var vcity={ 11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",    2             21:"辽宁",22:"吉林",23:"黑龙江",31:"上海",32:"江苏",    3             33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",    4             42:"湖北",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",    5             51:"四川",52:"贵州",53:"云南",54:"西藏",61:"陕西",62:"甘肃",    6             63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外"    7            };    8     9 checkCard = function()   10 {   11     var card = document.getElementById(‘card_no‘).value;   12     //是否为空   13     if(card === ‘‘)   14     {   15         alert(‘请输入身份证号，身份证号不能为空‘);   16         document.getElementById(‘card_no‘).focus;   17         return false;   18     }   19     //校验长度，类型   20     if(isCardNo(card) === false)   21     {   22         alert(‘您输入的身份证号码不正确，请重新输入‘);   23         document.getElementById(‘card_no‘).focus;   24         return false;   25     }   26     //检查省份   27     if(checkProvince(card) === false)   28     {   29         alert(‘您输入的身份证号码不正确,请重新输入‘);   30         document.getElementById(‘card_no‘).focus;   31         return false;   32     }   33     //校验生日   34     if(checkBirthday(card) === false)   35     {   36         alert(‘您输入的身份证号码生日不正确,请重新输入‘);   37         document.getElementById(‘card_no‘).focus();   38         return false;   39     }   40     //检验位的检测   41     if(checkParity(card) === false)   42     {   43         alert(‘您的身份证校验位不正确,请重新输入‘);   44         document.getElementById(‘card_no‘).focus();   45         return false;   46     }   47     alert(‘OK‘);   48     return true;   49 };   50    51    52 //检查号码是否符合规范，包括长度，类型   53 isCardNo = function(card)   54 {   55     //身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X   56     var reg = /(^\d{15}$)|(^\d{17}(\d|X)$)/;   57     if(reg.test(card) === false)   58     {   59         return false;   60     }   61    62     return true;   63 };   64    65 //取身份证前两位,校验省份   66 checkProvince = function(card)   67 {   68     var province = card.substr(0,2);   69     if(vcity[province] == undefined)   70     {   71         return false;   72     }   73     return true;   74 };   75    76 //检查生日是否正确   77 checkBirthday = function(card)   78 {   79     var len = card.length;   80     //身份证15位时，次序为省（3位）市（3位）年（2位）月（2位）日（2位）校验位（3位），皆为数字   81     if(len == ‘15‘)   82     {   83         var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/;    84         var arr_data =http://www.mamicode.com/ card.match(re_fifteen);   85         var year = arr_data[2];   86         var month = arr_data[3];   87         var day = arr_data[4];   88         var birthday = new Date(‘19‘+year+‘/‘+month+‘/‘+day);   89         return verifyBirthday(‘19‘+year,month,day,birthday);   90     }   91     //身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X   92     if(len == ‘18‘)   93     {   94         var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/;   95         var arr_data =http://www.mamicode.com/ card.match(re_eighteen);   96         var year = arr_data[2];   97         var month = arr_data[3];   98         var day = arr_data[4];   99         var birthday = new Date(year+‘/‘+month+‘/‘+day);  100         return verifyBirthday(year,month,day,birthday);  101     }  102     return false;  103 };  104   105 //校验日期  106 verifyBirthday = function(year,month,day,birthday)  107 {  108     var now = new Date();  109     var now_year = now.getFullYear();  110     //年月日是否合理  111     if(birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day)  112     {  113         //判断年份的范围（3岁到100岁之间)  114         var time = now_year - year;  115         if(time >= 3 && time <= 100)  116         {  117             return true;  118         }  119         return false;  120     }  121     return false;  122 };  123   124 //校验位的检测  125 checkParity = function(card)  126 {  127     //15位转18位  128     card = changeFivteenToEighteen(card);  129     var len = card.length;  130     if(len == ‘18‘)  131     {  132         var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);   133         var arrCh = new Array(‘1‘, ‘0‘, ‘X‘, ‘9‘, ‘8‘, ‘7‘, ‘6‘, ‘5‘, ‘4‘, ‘3‘, ‘2‘);   134         var cardTemp = 0, i, valnum;   135         for(i = 0; i < 17; i ++)   136         {   137             cardTemp += card.substr(i, 1) * arrInt[i];   138         }   139         valnum = arrCh[cardTemp % 11];   140         if (valnum == card.substr(17, 1))   141         {  142             return true;  143         }  144         return false;  145     }  146     return false;  147 };  148   149 //15位转18位身份证号  150 changeFivteenToEighteen = function(card)  151 {  152     if(card.length == ‘15‘)  153     {  154         var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);   155         var arrCh = new Array(‘1‘, ‘0‘, ‘X‘, ‘9‘, ‘8‘, ‘7‘, ‘6‘, ‘5‘, ‘4‘, ‘3‘, ‘2‘);   156         var cardTemp = 0, i;     157         card = card.substr(0, 6) + ‘19‘ + card.substr(6, card.length - 6);  158         for(i = 0; i < 17; i ++)   159         {   160             cardTemp += card.substr(i, 1) * arrInt[i];   161         }   162         card += arrCh[cardTemp % 11];   163         return card;  164     }  165     return card;  166 };   

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">    <html>    <head>    <meta http-equiv="Content-Type" content="text/html; charset=GB2312">    <title>Check card no</title>    <script type=‘text/javascript‘ src=‘card.js‘></script>    </head>    <body>    请输入身份证号码：    <input name=‘card_no‘ type=‘text‘ id=‘card_no‘ value=‘‘ />    <input type=‘button‘ name=‘submit‘ value=‘click me‘ onclick=‘javascript:checkCard();‘ />    </body>    </html>