無法從BackBone中的REST調用中獲取數據：未捕獲的TypeError：無法讀取未定義的屬性'length'

Question

我在使用Backbone從REST端點檢索json數據時遇到問題。 它將console.log整個json源，但給我一個JSON輸出中實際值的“未捕獲的TypeError：無法讀取屬性'length'of undefined”錯誤。 我可以使用對REST端點的直接AJAX調用來按需檢索數據，如下所示：

$.ajax({
    async: false,
    url: "http://myajaxcall.com/articles/featured",
    type: "GET",
    headers: { "Accept": "application/json;odata=verbose" },
    success: function (data) {
        $.each(data.aside, function (index, value) {
            console.log(value.headLine);
        });
    }
            });

但是我無法讓BackBone獲取相同的數據。 我在哪里出錯？

    var featuredArticle = Backbone.Model.extend({
    defaults: {
        id: '',
        headLine: '',
        snippet: '',
        fullStory: '',
        location: '',
        nsfw: '',
        category: '',
        relatedArticleIds: '',
        hasVideoPlaceholder: '',
        numberOfImages: ''
    }
});
var featuredArticles = Backbone.Collection.extend({
    model: featuredArticle,
    url: 'http://myajaxcall.com/articles/featured'
});

var articleView = Backbone.View.extend({
    tagName: 'ul',
    render: function () {
        var that = this;
        var getfeaturedArticles = new featuredArticles();
        getfeaturedArticles.fetch({
            dataType:"json",
        success: function(data) {
            console.log(getfeaturedArticles);
            $.each(data.aside, function (index, value) {
                console.log(value.headline);
                $(that.el).append('<li>' + value.headLine + '</li>');
            });
        }
        })

        return this;
    }
});
var articles = new articleView();
$("body").append(articles.render().el);

Answer 1

回調應如下所示：

success: function(model, response)  {
    console.log(response);
}