调用Backbone集合的获取函数时出现“未定义不是函数”错误

Question

我在调用fetch函数时出现错误。

Undefined is not a function Error in Backbone js 

var models = Backbone.Model.extend({ 
 
    userId: function() { 
 
    return this.get('userId'); 
 
    }, 
 
    id: function() { 
 
    return this.get('id'); 
 
    }, 
 
    body: function() { 
 
    return this.get('body'); 
 
    } 
 
}); 
 
//Collections 
 
var todolistStore = Backbone.Collection.extend({ 
 
    url: function() { 
 
    return 'https://jsonplaceholder.typicode.com/posts' 
 
    }, 
 
    model: models, 
 
    parse: function(response) { 
 
    return response; 
 
    } 
 
}); 
 
todolistStore.fetch();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<script src="https://ajax.cdnjs.com/ajax/libs/underscore.js/1.1.4/underscore-min.js" type="text/javascript"></script> 
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min.js" type="text/javascript"></script>

Answer 1

有几个问题。我正在建立@ChrisG的答案。

1. 您需要实例化一个集合。下面是我的代码：

   var Model = Backbone.Model.extend({ 
       userId: function() { 
        return this.get('userId'); 
       }, 
       id: function() { 
        return this.get('id'); 
       }, 
       body: function() { 
        return this.get('body'); 
       } 
   }); 
   
   //Collections 
   var TodoListStore = Backbone.Collection.extend({ 
       url: function() { 
        return 'https://jsonplaceholder.typicode.com/posts' 
       }, 
       model: Model, 
       parse: function(response) { 
        return response; 
       } 
   }); 
   
   var todolistStore = new TodoListStore(); 
   todolistStore.fetch(); 
   

2. 我更新下划线的版本和骨干

   https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.3.3/backbone-min.js