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js 验证身份证号码

网上的资料东一块,西一块。总结一下。
[html] 
<html> 
 <head> 
  <title>身份证测试</title> 
    <script type="text/javascript"> 
        function isIdCardNo() {          
            var tex = document.getElementById('identityid'); 
            var num = document.getElementById('identityid').value; 
            //alert("您输入的身份证号码是:\n" + 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!\n身份证号码为15位时,应全为数字,\n身份证号码为18位时,末位可以为数字或X。'); 
                tex.value=''; 
                tex.focus(); 
                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; 
             
            //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('输入的15位身份证号里出生日期不对!');    
                    tex.value=''; 
                    tex.focus(); 
                    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];  
                    //alert("该15位身份证对应的18位是:" + num); 
                    //return num;    
                }    
            }  
             
            //当身份证号为18位时,校验出生日期和校验位。 
            if (len == 18)  
            {  
                var year = num.substr(6,4); 
                //alert("year是:" + year); 补充:web前端 , JavaScript ,

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