最权威的判断身份证是否合法

function recard(value){
  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 "
  }
  var num = value.toUpperCase();
  if (!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(num))) {
      // alert('身份证位数格式错误！');
      return false;
  }
  if (aCity[parseInt(num.substr(0, 2))] == null){
      // alert('身份证格式错误！');
      return false;
  }
  var len, re;
  len = num.length;
  if (len == 15) {
      re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/);
      var arrSplit = num.match(re);
      var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);
      var bGoodDay;
      bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(
          arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));
      if (!bGoodDay) {
          // alert('身份证日期格式错误');
          return false;
      } else {
          var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
          var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
          var nTemp = 0,
              i;
          num = num.substr(0, 6) + '19' + num.substr(6, num.length - 6);
          for (i = 0; i < 14; i++) {
              nTemp += num.substr(i, 1) * arrInt[i];
          }
          num += arrCh[nTemp % 11];
          return true;
      }
  }
  if (len == 18) {
      re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);
      var arrSplit = num.match(re);
      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('身份证日期格式错误');
          return false;
      } else {
          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('身份证格式错误！');
              return false;
          }
          return true;
      }
  }
}