身份证js检测

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()
{
    var card = document.getElementById('card_no').value;
    //是否为空
    if(card === '')
    {
        alert('请输入身份证号，身份证号不能为空');
        document.getElementById('card_no').focus;
        return false;
    }
    //校验长度，类型
    if(isCardNo(card) === false)
    {
        alert('您输入的身份证号码不正确，请重新输入');
        document.getElementById('card_no').focus;
        return false;
    }
    //检查省份
    if(checkProvince(card) === false)
    {
        alert('您输入的身份证号码不正确,请重新输入');
        document.getElementById('card_no').focus;
        return false;
    }
    //校验生日
    if(checkBirthday(card) === false)
    {
        alert('您输入的身份证号码生日不正确,请重新输入');
        document.getElementById('card_no').focus();
        return false;
    }
    //检验位的检测
    if(checkParity(card) === false)
    {
        alert('您的身份证校验位不正确,请重新输入');
        document.getElementById('card_no').focus();
        return false;
    }
    alert('OK');
    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;
};
};

<!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='jquery.min.js'></script>
<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>