<form id="validatorForm">
  ...
  <div class="form-group fieldValue-parDiv valideDiv">
    <select name="directPicker" id="selectDirect" class="form-control form-control28">
      <option value="fromEastToWest">自东向西</option>
      <option value="fromWestToEast">自西向东</option>
      <option value="fromSourthToNorth">由南往北</option>
      <option value="fromNorthToSourth">由北往南</option>
    </select>
  </div>
  ...
  <button type="button" id="resetForm">重置<button>
</form>

$('#resetForm').on('click', function () {
  //下拉选框初始化
  $("#selectDirect").selectpicker('deselectAll');
})

$('#resetForm').on('click', function () {
  //下拉选框初始化
  $("#selectDirect").selectpicker('deselectAll');

  //启用字段验证器
  $('#validatorForm').data('bootstrapValidator').enableFieldValidators('directPicker', true);
})