javascript - Backbone.js - 错误加载脚本

Question

我的 html header 中包含 jquery.js、backbone.js 和 underscore.js(我可以从浏览器中看到这些文件)

 <script type='text/javascript'>
    (function($){
     var Student= Backbone.Model.extend({
          initialize: function(){
              console.log("studentis createrd");
          }
      });

        var students= Backbone.Collection.extend({
            model: Student
        });  

        console.log(students.models);
    })(jQuery);
</script>

我收到这个错误信息

更新:html 标题

<script src="/static/js/jquery.js" type="text/javascript"> </script>
<script src="/static/js/backbone.js" type="text/javascript"></script>
 <script src="/static/js/underscore.js" type="text/javascript"></script>

Answer 1

首先您需要确保 Backbone 已正确加载 --

顺序应该是

   ---> jQuery
   ---> underscore
   ---> backbone

接下来需要创建一个集合的新实例

在创建模型或集合的实例之前，您不能直接对其进行操作。

(function ($) {
    var Student = Backbone.Model.extend({  // Created a Student model
        initialize: function () {
            console.log("studentis createrd");
        }
    });

    var Students = Backbone.Collection.extend({  // Create a Students collection
        model: Student
    });

    var student = new Student(); // Create a instance of Student model

    var students = new Students(); // New instance of Students collection
    students.add(student);   // Add a model to the collection

    console.log(students.models);
})(jQuery);

Check Fiddle