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 createAlert('注意',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。');
        $('.mask').show();
        $(".delete_pop").show();
        return false;          
    }   
    //验证前2位，城市符合  
    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){   
        $('.mask').show();
        $(".delete_pop").show();
        return false;  
    }  
    //alert('城市:'+aCity[parseInt(num.substr(0,2))]);  
      
    //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})$/);  
        var arrSplit = num.match(re);  //检查生日日期是否正确  
        var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);  
        var bGoodDay; bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));  
        if (!bGoodDay) {          
           // alert('身份证号的出生日期不对！');             
            return false;  
        } else { //将15位身份证转成18位 //校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10。         
            var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);          
            var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');       
            var nTemp = 0, i;             
            num = num.substr(0, 6) + '19' + num.substr(6, num.length - 6);            
            for(i = 0; i < 17; i ++) {                  
                nTemp += num.substr(i, 1) * arrInt[i];         
            }  
            num += arrCh[nTemp % 11];  
            return true;  
        }  
    }  
    if (len == 18) {  
        re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);  
        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('身份证号的出生日期不对！');  
            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);  
                //alert('18位身份证号的校验码不正确！');  
                return false;  
            }  
            return true;  
        }  
    } return false;  
  
}