angularjs 默认选中ng-repeat的一个

HTML：

1 <ul class="face-moni-list">
2         <li ng-repeat = "camera in CameraList" ng-click="searchCamera(camera.cameraId)"
3             ng-class="{false:'defaultClass',true:'activeClass'}[choseIndex==camera.cameraId]">
4             <i class="fa fa-video-camera"></i> {{camera.cameraName}}</li>
5     </ul>

CSS：

 1 .moni-left .face-moni-list li:hover {
 2     border: 1px solid #1682c3 !important;
 3 }
 4 .moni-left .face-moni-list li.defaultClass {
 5     background: #fff;
 6     color: #666;
 7 }
 8 .moni-left .face-moni-list li.activeClass {
 9     background: #7abce4;
10     color: #fff;
11 }

JS：

 1 $scope.searchCamera={};
 2         $scope.CameraList = {};
 3         $scope.choseIndex = "";  //申明一个参数
 4         /*$http.post($scope.URL+ 'camera/getCameraList', $scope.searchCamera).success(function(data) {
 5             $scope.CameraList = data.data.list;
 6         });*/
 7         $http.get("json/camera.json").success(function(data) {
 8             $scope.CameraList = data.data;
 9             $scope.choseIndex = $scope.CameraList[0].cameraId;   //给参数默认赋值数组的第一个
10         });
11 
12 $scope.searchCamera = function(cameraId){
13             $scope.choseIndex = cameraId;
14         }