.changeSort('Timestamp')">
                  时间
                  <datatable-sort-icon key="Timestamp" selected-sort-key="{{ $ctrl.sort.key }}" reverse-order="$ctrl.sort.desc"></datatable-sort-icon>
                </a>
              </th>
              <th class="small-column">
                <a ng-click="$ctrl.changeSort('Username')">
                  用户
                  <datatable-sort-icon key="Username" selected-sort-key="{{ $ctrl.sort.key }}" reverse-order="$ctrl.sort.desc"></datatable-sort