Backbone - 使用Jasmine测试一个简单的模型会导致TypeError

Question

我试图学习使用Jasmine测试基于Backbone的应用程序的方法.为此,我从这里获取了一些示例代码:http://msdn.microsoft.com/en-us/scriptjunkie/hh377172.

    Photo = new Backbone.Model.extend({
        defaults:{
            title: 'Another photo!',
            tags:  ['untagged'],
            location: 'home',
            src: 'placeholder.jpg'
        },
        initialize: function(){
            console.log('this model has been initialized');
            this.bind("change:title", function(){
                var title = this.get("title");
                console.log("My title has been changed to.." + title);
            });
        },

        setTitle: function(newTitle){
            this.set({ title: newTitle });
        }
    });

然后编写测试规范如下:

    describe("Photo Model", function() {
        it("verifies title", function() {
        var myPhoto = new Photo();
        myPhoto.set({ title: "On the beach" });   
        expect(myPhoto.get("title"))
            .toEqual("On the beach");
        });
    });

在运行它时,测试因TypeError而失败

    TypeError: Object [object Object] has no method 'apply'
        at new <anonymous> (http://localhost:88/backbone/WebClient-Backbone2/js/backbone.js:1103:41)
        at [object Object].<anonymous> (http://localhost:88/backbone/WebClient-Backbone2/test/spec.js:28:16)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1001:15)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)
        at [object Object].start (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1743:8)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:2070:14)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)
        at [object Object].start (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1743:8)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:2215:14)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)     

Answer 1

正如评论中所提到的,我发现,这是由于模型定义中的"新".

所以,改变后,

    var Photo = new Backbone.Model.extend({

至

    var Photo = Backbone.Model.extend({

错误消失了.