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我是一个新的 Backbone.js 。我试图显示一些JSON内容到这个HTML模板。创建了一个集合，并获取JSON文件数据。在集合的呈现方法，更新模型，这是绑定到视图。
请指出问题出在哪里。

<script type="text/template" id="banner_template">
     <div class="span8"><img src="<%=img%>"></div>
     <div class="span4 bg-lightRedcustom no-margin"><div class="bnrPadding"><h2 class="fg-white"><%=html%></h2></div></div>
</script> 

 <div id="banner_container"> </div>

<script type="text/javascript">
var BannerModel=Backbone.Model.extend({id:"",img:"",html:""});
var bannerModel=new BannerModel();
  var BannerCollection=Backbone.Collection.extend({
          model:BannerModel,
          url:"res/banner-res.json",
          parse: function (response) {
            return response;
            },
        render: function() {         
                this.fetch({success:function(a){                     
                     _.each(a.toJSON(),function(obj){                           
                        if(obj.id=="services1.html"){bannerModel.set({id:obj.id,img:obj.img,html:obj.html});
                            console.log(bannerModel);
                        }                      
                        });
                   }}
                );
            return this;
         },
      });
var bannerCollection=new BannerCollection();
bannerCollection.render();

 var BannerView = Backbone.View.extend({
         initialize: function(){  
             this.render();          
         },               
         template: _.template($("#banner_template").html()),
         render: function(){                
             this.$el.html( this.template(this.model.toJSON()) );             
         }
     });   

 var banner_view = new BannerView({ el: $("#banner_container"),model:bannerModel});

更新1
**

这是我的代码

<script type="text/template" id="banner_template">
 <div class="span8"><img src="<%=img%>"></div>
 <div class="span4 bg-lightRedcustom no-margin"><div class="bnrPadding"><h2 class="fg-white"><%=html%></h2></div></div>
</script> 
 <div id="banner_container"> </div>
<script type="text/javascript">
var BannerCollection=Backbone.Collection.extend({        
          url:"res/banner-res.json"
      });
var bannerCollection=new BannerCollection();

var BannerModel=Backbone.Model.extend({});
var bannerModel=new BannerModel({});
var BannerView = Backbone.View.extend({
         el: $("#banner_container"),
         initialize: function(){             
             this.model.on('change',this.render,this);
             bannerCollection.fetch({success:function(a){                                 
                     _.each(a.toJSON(),function(obj){                           
                        if(obj.bid=="services1.html"){                          
                            bannerModel.set({img:obj.img,html:obj.html});                                               
                        }                      
                      });
                   }}
                );                      
         },      
         model:bannerModel,         
         template: _.template($("#banner_template").html()),
         render: function(){  
            this.$el.html(this.template(bannerModel.toJSON()) );   
         }
     });         
var banner_view = new BannerView({model:bannerModel});
</script>