   <select id="hour" name="hour"></select>
          <label for="hour">时</label>
        </span>
        <span>
          <select id="minute" name="minute"></select>
          <label for="minute">分</label>
        </span>
      </div>
    </div>
  </form>

  <script>
// 定义变量
var nativePicker = document.querySelector('.nativeDateTimePicker');
var fallbackPicker = document.querySelector('.fallbackDateTimePicker');
var fallbackLabel = document.querySelector('.fallbackLabel');

var yearSelect = docu