js实现身份证号码严格验证

var area={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');
        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');
        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');
        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');
        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');
        return false;
    }
    return true;//正确的身份证号
};

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

//检查出生日期
verifyBirthday = function(idLen,year,month,day){
    var curr_year = new Date().getFullYear();
    var ereg='/^((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))$/';//平年出生月日的格式;

    if (parseInt(year) % 4 == 0 || (parseInt(year) % 100 == 0 && parseInt(year)% 4 == 0 )){
        ereg='/^((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))$/';//闰年出生月日的格式;
    }

    var time = curr_year - year;
    if(time > 0 && time <= 200){//合理的年龄范围
        var patt=new RegExp(ereg);
        return patt.test(month+day); //检查闰年和非闰年的日期是否正确
    }
    return false;
};

//校验位的检查
checkParity = function(card){
    var cardTemp = 0;
    var len = card.length;
    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');
    if(len == '15'){
        card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6);
    }
    for(var i = 0; i < 17; i ++){
        cardTemp += card.substr(i, 1) * arrInt[i];
    }
    var valnum = arrCh[cardTemp % 11];
    if (valnum == card.substr(17, 1)){
        return true;
    }
    return false;
};