Angularjs Angularfire forEach键返回未定义

我有一些数据

{
    "projects" : [
        {
            "projectName" : "Test Project 1",
            "dueDate" : "20/05/2014",
            "owner" : "Test owners 1",
            "categories" : [
                "JavaScript",
                "HTML",
                "CSS"
            ],
            "open" : true,
            "tasks" : [
                {
                    "taskName" : "Test task 1",
                    "targetDate" : "02/04/2014",
                    "categories" : [
                        "JavaScript",
                        "HTML",
                        "CSS"
                    ],
                    "open" : true
                },
                {
                    "taskName" : "Test task 2",
                    "targetDate" : "10/04/2014",
                    "categories" : [
                        "JavaScript",
                        "HTML"
                    ],
                    "open" : true
                }
            ]
        },
        {
            "projectName" : "Test Project 2",
            "dueDate" : "12/07/2014",
            "owner" : "Test owners 2",
            "categories" : [
                "JavaScript",
                "HTML",
                "CSS"
            ],
            "open" : true,
            "tasks" : [
                {
                    "taskName" : "Test task 1",
                    "targetDate" : "13/05/2014",
                    "categories" : [
                        "HTML",
                        "CSS"
                    ],
                    "open" : true
                },
                {
                    "taskName" : "Test task 2",
                    "targetDate" : "03/06/2014",
                    "categories" : [
                        "JavaScript"
                    ],
                    "open" : true
                }
            ]
        }
    ]
}

然后我有一个简单的控制器，它试图输出每个数组索引中包含的对象

TM.factories.getData = function(){
    var getProjects = new Firebase("https://<my-firebase>.firebaseio.com/projects");
    return getProjects;
};

TM.controllers = {};

TM.controllers.overviewCtrl = function($scope,$firebase){
    var taskArr = [];
    $scope.projectList =  $firebase(TM.factories.getData());
    $scope.projectList.$on("loaded", function() {
        $scope.projectList.$getIndex().forEach(function(key,i) {
            console.log($scope.projectList[key]);
        });
    });
};

TM.factories.getData=function（）{
var getProjects=newfirebase（“https://.firebaseio.com/projects");
返回项目；
};
TM.controllers={}；
TM.controllers.overviewCtrl=函数（$scope，$firebase）{
var taskArr=[]；
$scope.projectList=$firebase（TM.factories.getData（））；
$scope.projectList.$on（“已加载”，函数（）{
$scope.projectList.$getIndex（）.forEach（函数（键，i）{
log（$scope.projectList[key]）；
});
});
};

不用担心它的布局，我正在尝试用不同的方式编写它，这是非常早期的开发工作

问题是为什么我在使用“key”或“I”时变得未定义？如果我只记录“key”或“I”，我得到0,1。

你能试试这个吗：

TM.controllers.overviewCtrl = function($scope,$firebase){
    var taskArr = [];
    $scope.projectList =  $firebase(TM.factories.getData());
    $scope.projectList.$on("loaded", function(projectList) {
        projectList.$getIndex().forEach(function(value,key) {
            console.log(projectList[key]);
        });
    });
};

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谢谢，现在说得通了