第二个函数

function isIdCardNo(num) {           
    num = num.toUpperCase();           //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('输入的身份证号长度不对，或者号码不符合规定！\n15位号码应全为数字，18位号码末位可以为数字或X。');             
        return false;        
    } //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。
    //下面分别分析出生日期和校验位
    var len, re; len = num.length; if (len == 15) {
        re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/);
        var arrSplit = num.match(re);  //检查生日日期是否正确
        var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);
        var bGoodDay; bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));
        if (!bGoodDay) {        
            alert('输入的身份证号里出生日期不对！');           
            return false;
        } else { //将15位身份证转成18位 //校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10。       
            var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);        
            var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');     
            var nTemp = 0, i;           
            num = num.substr(0, 6) + '19' + num.substr(6, num.length - 6);          
            for(i = 0; i < 17; i ++) {                
                nTemp += num.substr(i, 1) * arrInt[i];       
            }
            num += arrCh[nTemp % 11];
            return true;
        }
    }
    if (len == 18) {
        re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);
        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(dtmBirth.getYear());
            alert(arrSplit[2]);
            alert('输入的身份证号里出生日期不对！');
            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('18位身份证的校验码不正确！应该为：' + valnum);
                return false;
            }
            return true;
        }
    } return false;

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