Angular点击当前行使用$event改变行的背景色，应该怎么用？求解~

<tr class="trClass" ng-repeat="pojo in list" ng-click="updateSelections($event,pojo.id)" >
                <td>{{pojo.count}}</td>
                   <td>{{pojo.parentName}}</td>
                <td>{{pojo.subName}}</td>
                <td>{{pojo.sortNum}}</td>
                <td>{{pojo.remark}}</td>
                <td>{{pojo.ascription}}</td>
             <td class="text-center">                                          
                  <button type="button" class="btn bg-olive btn-xs"  data-toggle="modal" data-target="#editModal" ng-click="findOne(pojo.id)" >操作</button>
                   </td>
                         </tr>

$scope.updateSelections=function (event,id) {
        $(event.currentTarget).removeClass("active");
        $(event.currentTarget).addClass("active");

.active{
            background-color: #9f191f;
        }

https://blog.csdn.net/lishuaileibo/article/details/78796291