js验证身份证合法性

var vcity = {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" 
            }; 
 
checkCard = function(card) { 
    //是否为空 
    if(card === '') { 
        return false; 
    } 
    //校验长度，类型 
    if(isCardNo(card) === false) { 
        return false; 
    } 
    //检查省份 
    if(checkProvince(card) === false) { 
        return false; 
    } 
    //校验生日 
    if(checkBirthday(card) === false) { 
        return false; 
    } 
    //检验位的检测 
    if(checkParity(card) === false) 
    { 
        return false; 
    } 
    return true; 
}; 
 
//检查号码是否符合规范，包括长度，类型 
isCardNo = function(card) { 
    //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 
    var reg = /(^\d{15}$)|(^\d{17}(\d|X)$)/; 
    if(reg.test(card) === false) { 
        return false; 
    } 
    return true; 
}; 
 
//取身份证前两位,校验省份 
checkProvince = function(card) { 
    var province = card.substr(0,2); 
    if(vcity[province] == undefined) { 
        return false; 
    } 
    return true; 
}; 
 
//检查生日是否正确 
checkBirthday = function(card) { 
    var len = card.length; 
    //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 
    if(len == '15') { 
        var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/;  
        var arr_data = card.match(re_fifteen); 
        var year = arr_data[2]; 
        var month = arr_data[3]; 
        var day = arr_data[4]; 
        var birthday = new Date('19'+year+'/'+month+'/'+day); 
        return verifyBirthday('19'+year,month,day,birthday); 
    } 
    //身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X 
    if(len == '18') { 
        var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/; 
        var arr_data = card.match(re_eighteen); 
        var year = arr_data[2]; 
        var month = arr_data[3]; 
        var day = arr_data[4]; 
        var birthday = new Date(year+'/'+month+'/'+day); 
        return verifyBirthday(year,month,day,birthday); 
    } 
    return false; 
}; 
 
//校验日期 
verifyBirthday = function(year,month,day,birthday) { 
    var now = new Date(); 
    var now_year = now.getFullYear(); 
    //年月日是否合理 
    if(birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day) { 
        //判断年份的范围（3岁到100岁之间) 
        var time = now_year - year; 
        if(time >= 3 && time <= 100) { 
            return true; 
        } 
        return false; 
    } 
    return false; 
}; 
 
//校验位的检测 
checkParity = function(card) { 
    //15位转18位 
    card = changeFivteenToEighteen(card); 
    var len = card.length; 
    if(len == '18') { 
        var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);  
        var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');  
        var cardTemp = 0, i, valnum;  
        for(i = 0; i < 17; i ++) {  
            cardTemp += card.substr(i, 1) * arrInt[i];  
        }  
        valnum = arrCh[cardTemp % 11];  
        if (valnum == card.substr(17, 1)) { 
            return true; 
        } 
        return false; 
    } 
    return false; 
}; 
 
//15位转18位身份证号 
changeFivteenToEighteen = function(card) { 
    if(card.length == '15') { 
        var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);  
        var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');  
        var cardTemp = 0, i;    
        card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6); 
        for(i = 0; i < 17; i ++) {  
            cardTemp += card.substr(i, 1) * arrInt[i];  
        }  
        card += arrCh[cardTemp % 11];  
        return card; 
    } 
    return card; 
};

内容出自：http://chinahnzhou.iteye.com/blog/1685898
全文黏贴到本人博客，以备后用，谢谢作者