js前端身份证完美验证

ar 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; 
};

test.html
Html代码  收藏代码
<!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>