backbone.js - 未填充主干 JS 集合

Question

刚开始使用骨干网，一切都很顺利，直到我尝试加载一些 Json 数据。

// Category Model
var Category = Backbone.Model.extend({
    defaults: {
        title: "Not specfied",
        paramName: "not_specified",
        filter: false
    },
    initialize: function(){
        console.log("Cateogory Model Initialized");
    }
});

// Category Collection
var CategoryList = Backbone.Collection.extend({
    url: '/assets/js/libs/items.json',
    parse: function(resp, xhr) {
        return resp.facets;
    },
    model: Category,
    initialize : function() {
        console.log('This Collection has been called');
    }
});

var categories = new CategoryList();
categories.fetch();

如果我尝试查看集合中的任何项目，它是空的！

我的 json 文件如下所示

 {
"facets": [
  {
"title": "Military Service & Conflict",
"searchParam": "Military"
  },  
 {
"title":"Census, land & substitutes",
"searchParam":"Census"   
 },
 {
"title":"Education & work",
"searchParam":"Education"   
}
]
}

如果我能做到这一点，我只需要整理一下我的观点

抢