一个完整的 JS 身份证校验代码

一个完整的 JS 身份证校验代码

/**

 * 校验身份证号合法性

 */

function checkIdNumberValid(tex){

    var tip = '输入的身份证号有误，请检查后重新输入！';

    var num = tex.value;

    num = num.toUpperCase();

    var len, re;

    len = num.length;

    if(len == 0) return true;

    //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。

    if (!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(num))){

        alert(tip);

        tex.focus();

        return false;

    }

    //验证前两位地区是否有效

    var aCity= {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"}

    if(aCity[parseInt(num.substr(0,2))] == null){

        alert(tip);

        tex.focus();

        return false;

    }

    //当身份证为15位时的验证出生日期。

    if (len == 15){

        re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/);

        var arrSplit = num.match(re);

        //检查生日日期是否正确

        var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);

        var bGoodDay;

        bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));

        if (!bGoodDay){

            alert(tip);

            tex.focus();

            return false;

        }

    }

    //当身份证号为18位时，校验出生日期和校验位。

    if (len == 18){

        re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);

        var arrSplit = num.match(re);

        //检查生日日期是否正确

        var dtmBirth = new Date(arrSplit[2] + "/" + arrSplit[3] + "/" + arrSplit[4]);

        var bGoodDay;

        bGoodDay = (dtmBirth.getFullYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));

        if (!bGoodDay){

            alert(tip);

            tex.focus();

            return false;

        }

        else{

            //检验18位身份证的校验码是否正确。

            //校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10。

            var valnum;

            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 nTemp = 0, i;

            for(i = 0; i < 17; i ++){

                nTemp += num.substr(i, 1) * arrInt[i];

            }

            valnum = arrCh[nTemp % 11];

            if (valnum != num.substr(17, 1)){

                alert(tip);

                tex.focus();

                return false;

            }

        }

    }

    return true;

}