我正在尝试使用下面的代码在两个选择列表之间移动项目，但是没有将项目从availableClients列表移动到selectedClients列表，所以有人可以检查下面的代码并让我知道我在这里缺少什么吗？谢谢

  <div ng-app>
  <div ng-controller="testCtrl">

            <label for="aclients">Available Clients</label>                                
            <select size="5" multiple ng-model="available" ng-options="client.id as client.Name for client in clientsList" style="width: 400px"></select>

            <input id="moveright" type="button" value="Add Client" ng-click="moveItem(available[0], availableclients,selectedclients)" />
            <input id="moverightall" type="button" value="Add All Clients" ng-click="moveAll(availableclients,selectedclients)" />
            <input id="move left" type="button" value="Remove Client" ng-click="moveItem(selected[0], selectedclients,availableclients)" />    
            <input id="moveleftall" type="button" value="Remove All Clients" ng-click="moveAll(availableclients,selectedclients)" />

            <label for="sclients">Selected Clients</label>                                                    
            <select size="5" multiple ng-model="selected" ng-options="client.id as client.Name for client in selectedclients" style="width: 400px"></select>
            <div>Selected Clients IDs: {{selectedclients}}</div>

  </div>
  </div>

控制器：

  app.controller('testCtrl',
        function testCtrl($scope, clientsService){


   $scope.clientsList = clientsService.getClientsList().then(
            function(response){
               $scope.clientsList = response;
            },
            function(status){
               console.log(status);
            }
    );

    $scope.moveItem = function(item, from, to) {

        console.log('Move item   Item: '+item+' From:: '+from+' To:: '+to);
        //Here from is returned as blank and to as undefined

        var idx=from.indexOf(item);
        if (idx != -1) {
            from.splice(idx, 1);
            to.push(item);      
        }
    };
    $scope.moveAll = function(from, to) {

        console.log('Move all  From:: '+from+' To:: '+to);
        //Here from is returned as blank and to as undefined

        angular.forEach(from, function(item) {
            to.push(item);
        });
        from.length = 0;
    };

    $scope.availableclients = [];                
    $scope.selectedclients = [];


  });