JS验证身份证号码

/**
   * 验证身份证号码
   */
  isIdCardNo: function(num){
    var factorArr = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1);
    var error;
    var varArray = new Array();
    var intValue;
    var lngProduct = 0;
    var intCheckDigit;
    var intStrLen = num.length;
    var idNumber = num;
    // initialize 
    if ((intStrLen != 15) && (intStrLen != 18)) {
      return false;
    }
    // check and set value 
    for (var i = 0; i < intStrLen; i++) {
      varArray[i] = idNumber.charAt(i);
      if ((varArray[i] < '0' || varArray[i] > '9') && (i != 17)) {
        return false;
      } else if (i < 17) {
        varArray[i] = varArray[i] * factorArr[i];
      }
    }
    if (intStrLen == 18) {
      //check date 
      var date8 = idNumber.substring(6, 14);
      if (this.checkDate(date8) == false) {
        return false;
      }
      // calculate the sum of the products 
      for (var i = 0; i < 17; i++) {
        lngProduct = lngProduct + varArray[i];
      }
      // calculate the check digit 
      intCheckDigit = 12 - lngProduct % 11;
      switch (intCheckDigit) {
        case 10:
          intCheckDigit = 'X';
          break;
        case 11:
          intCheckDigit = 0;
          break;
        case 12:
          intCheckDigit = 1;
          break;
      }
      // check last digit 
      if (varArray[17].toUpperCase() != intCheckDigit) {
        return false;
      }
    } else {
      var date6 = idNumber.substring(6, 12);
      if (this.checkDate(date6) == false) {
        return false;
      }
    }
    return true;
  },
  /**
   * 验证省份证时间
   */
  checkDate: function(val){
    var pattern = /^(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)$/;
    if (pattern.test(val)) {
      var year = val.substring(0, 4);
      var month = val.substring(4, 6);
      var date = val.substring(6, 8);
      var date2 = new Date(year + "-" + month + "-" + date);
      if (date2 && date2.getMonth() == (parseInt(month) - 1)) {
        return true;
      }
    }
    return false;
  },

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