function isIdCardNo(num) {
        num = num.toUpperCase();      //身份證號碼為15位或者18位，15位時全為數(shù)字，18位前17位為數(shù)字，最后一位是校驗位，可能為數(shù)字或字符X。    
        if (!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(num))) {
          //alert('輸入的身份證號長度不對，或者號碼不符合規(guī)定！\n15位號碼應(yīng)全為數(shù)字，18位號碼末位可以為數(shù)字或X。');       
          //alert('身份證號長度不正確或不符合規(guī)定！');       
          return false;    
        } 
        //驗證前2位，城市符合
        var aCity={11:"北京",12:"天津",13:"河北",14:"山西",15:"內(nèi)蒙古",21:"遼寧",22:"吉林",23:"黑龍江 ",31:"上海",32:"江蘇",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山東",41:"河南",42:"湖北",43:"湖南",44:"廣東",45:"廣西",46:"海南",50:"重慶",51:"四川",52:"貴州",53:"云南",54:"西藏",61:"陜西",62:"甘肅",63:"青海",64:"寧夏",65:"新疆",71:"臺灣",81:"香港",82:"澳門",91:"國外"};
        if(aCity[parseInt(num.substr(0,2))]==null){
          //alert('身份證號不正確或不符合規(guī)定！');
          return false;
        }
        //alert('城市:'+aCity[parseInt(num.substr(0,2))]);
        
        //下面分別分析出生日期和校驗位
        var len, re; len = num.length; 
        if (len == 15) {
          re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/);
          var arrSplit = num.match(re); //檢查生日日期是否正確
          var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);
          var bGoodDay; bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));
          if (!bGoodDay) {    
            //alert('身份證號的出生日期不對！');      
            return false;
          } else { //將15位身份證轉(zhuǎn)成18位 //校驗位按照ISO 7064:1983.MOD 11-2的規(guī)定生成，X可以認為是數(shù)字10。    
            var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);    
            var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');   
            var nTemp = 0, i;      
            num = num.substr(0, 6) + '19' + num.substr(6, num.length - 6);     
            for(i = 0; i < 17; i ++) {        
              nTemp += num.substr(i, 1) * arrInt[i];    
            }
            num += arrCh[nTemp % 11];
            return true;
          }
        }
        if (len == 18) {
          re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);
          var arrSplit = num.match(re); //檢查生日日期是否正確
          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('身份證號的出生日期不對！');
            return false;
          }
          else { //檢驗18位身份證的校驗碼是否正確。 //校驗位按照ISO 7064:1983.MOD 11-2的規(guī)定生成，X可以認為是數(shù)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位身份證的校驗碼不正確！應(yīng)該為：' + valnum);
              //alert('18位身份證號的校驗碼不正確！');
              return false;
            }
            return true;
          }
        } 
        return false;
      };