一个完整校验身份证

一个完整校验身份证

/**
 * 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;
}