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function checkPersonIdcard(personnumber) {
  personnumber = personnumber.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(personnumber))) {
    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 = personnumber.length;
  if (len == 15) {
    re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/);
    var arrSplit = personnumber.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) {
      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;
      personnumber = personnumber.substr(0, 6) + '19' + personnumber.substr(6, personnumber.length - 6);
      for (i = 0; i < 17; i++) {
        nTemp += personnumber.substr(i, 1) * arrInt[i];
      }
      personnumber += 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 = personnumber.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) {
      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 += personnumber.substr(i, 1) * arrInt[i];
      }
      valnum = arrCh[nTemp % 11];
      if (valnum != personnumber.substr(17, 1)) {
        return false;
      }
      return true;
    }
  }
  return false;
}