身份证校验方法一般都是判断位数，但是专业一点或者要求高一点的，可以通过下面方法来做一下校验

总的校验方法

function validateIdCard(idCard){
    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"  
           };
    //是否为空
    if(idCard === ''){
        return false;
    }
    //校验长度，类型
    if(isCardNo(idCard) === false){
        return false;
    }
    //检查省份
    if(checkProvince(idCard,vcity) === false){
        return false;
    }
    //校验生日
    if(checkBirthday(idCard) === false){
        return false;
    }
    //检验位的检测
    if(checkParity(idCard) === false){
        return false;
    }
    return true;
}

检查号码是否符合规范，包括长度，类型

function isCardNo(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}$)|(^\d{17}(\d|X|x)$)/;
    if(reg.test(card) === false){
        return false;
    }
    return true;
}

取身份证前两位,校验省份

function checkProvince(card,vcity){
    var province = card.substr(0,2);
    if(vcity[province] == undefined){
        return false;
    }
    return true;
};

检查生日是否正确

function checkBirthday(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})$/; 
        var arr_data = card.match(re_fifteen);
        var year = arr_data[2];
        var month = arr_data[3];
        var day = arr_data[4];
        var birthday = new Date('19'+year+'/'+month+'/'+day);
        return verifyBirthday('19'+year,month,day,birthday);
    }
    //身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X
    if(len == '18'){
        var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X|x)$/;
        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

function verifyBirthday(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（0岁到100岁之间)
        var time = now_year - year;
        if(time >= 0 && time <= 100)
        {
            return true;
        }
        return false;
    }
    return false;
}

校验位的检测

function checkParity(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).toLocaleUpperCase()) 
        {
            return true;
        }
        return false;
    }
    return false;
}

15位转18位身份证号

function changeFivteenToEighteen(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;
}