JavaScript实现身份证验证代码实例

function isIdCardNo(num) {
        num = num.toUpperCase();      //SFZ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SFZ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。');       
          //alert('SFZ号长度不正确或不符合规定！');       
          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){
          //alert('SFZ号不正确或不符合规定！');
          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})$/);
          var arrSplit = num.match(re); //检查生日日期是否正确
          var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);
          var bGoodDay; bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));
          if (!bGoodDay) {    
            //alert('SFZ号的出生日期不对！');      
            return false;
          } else { //将15位SFZ转成18位 //校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10。    
            var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);    
            var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');   
            var nTemp = 0, i;      
            num = num.substr(0, 6) + '19' + num.substr(6, num.length - 6);     
            for(i = 0; i < 17; i ++) {        
              nTemp += num.substr(i, 1) * arrInt[i];    
            }
            num += arrCh[nTemp % 11];
            return true;
          }
        }
        if (len == 18) {
          re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);
          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('SFZ号的出生日期不对！');
            return false;
          }
          else { //检验18位SFZ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SFZ的校验码不正确！应该为：' + valnum);
              //alert('18位SFZ号的校验码不正确！');
              return false;
            }
            return true;
          }
        } 
        return false;
      };