类型错误：无法读取未定义的属性“push”，JavaScript

我正在这个 Angular 项目中工作，用户提交评论表单，新评论将添加到已发布的评论中。这是我的代码。

.controller('productCtrl', function($scope, $http, $routeParams, Page){
$scope.product = {};
$scope.review = {};
$scope.comments = {};

routeparm = $routeParams.param;

$scope.review = function(){
    var review_box = $scope.review_form.review_box;

    $http.post('./comment.php', {
        comment : review_box,
        code: routeparm
    })

    .success(function(data){
            $scope.comments.push(data.comments);
            $scope.review.review_box = '';
    })

    .error(function(data){
        $scope.has_error = true;
        $scope.error_message = data;
    })

};

但是，当我尝试添加评论时，出现以下错误。

TypeError: Cannot read property 'push' of undefined

我定义了一个空的 $scope.comments = {};那么为什么我会收到此错误？我该如何解决它？谢谢

您声明的注释是一个对象。只需将您的声明更改为数组即可，

From:

$scope.comments = {};

To:

$scope.comments = [];

EDIT:如果您需要推送新对象，您需要将注释作为对象数组，如下所示并推送新对象

$scope.comments = { 
    1: {name:'',review:'',comment:'',uptime:'',gravatar:''}
}

 $scope.comments.push({name:'rukshi', review:'test comment',comment:'yet another comment',uptime:'',gravatar:''});