Angular中ng-repeat与ul li的多层嵌套重复问题

<ul ng-repeat="it1 in list01">
  <li ng-click="show(it1)">{{it1.value}}</li>
  <ul ng-repeat="it2 in list02">
    <li>{{it2.value}}</li>
  </ul>
</ul>

  1-1
  1-2
  1-1
  1-2

  1-1
  1-2
  2-1
  2-2

<ul ng-repeat="it1 in list01">
  <li ng-click="show(it1)">{{it1.name}}</li>
  <ul ng-repeat="it2 in it1.child" ng-show="it1.showChild" style="text-indent:10px;">
    <li ng-click="show(it1, it2)">{{it2.name}}</li>
    <ul ng-repeat="it3 in it2.child" ng-show="it2.showChild" style="text-indent:10px;">
      <li ng-click="show(it1, it2, it3)">{{it3.name}}</li>
      <ul ng-repeat="it4 in it3.child" ng-show="it3.showChild">
        <li>{{it4.name}}</li>
      </ul>
    </ul>
  </ul>
</ul>

$http.get('ng01.json').success(function (_data) {
  $scope.list01 = [];
  $scope.list01 = _data.data;
});
$scope.show = function (it1, it2, it3) {
  if(it3 != null){
    $http.get("ng04.json").success(function (_data) {
      $scope.list04 = [];
      $scope.list04 = _data.data;
      for(var x in $scope.list03){
        $scope.list03[x].showChild = false;
      }
      it3.showChild = true;
      it3.child = _data.data;
     });
     return;
  }
  if(it2 != null){
    $http.get("ng03.json").success(function (_data) {
      $scope.list03 = [];
      $scope.list03 = _data.data;
      for(var x in $scope.list02){
        $scope.list02[x].showChild = false;
      }
      it2.showChild = true;
      it2.child = _data.data;
    });
    return;
  }
  $http.get("ng02.json").success(function (_data) {
    $scope.list02 = [];
    $scope.list02 = _data.data;
    for(var x in $scope.list01){
      $scope.list01[x].showChild = false;
    }
    it1.showChild = true;
    it1.child = _data.data;
  });
}

{
 "success":1,
 "data":[
  {"name":"01"},
  {"name":"02"}
 ]
}