BackboneJS collection.sync()方法

使用Backbone.sync持久化一个集合的状态到服务器。

语法

collection.sync(method, collection, options)

参数:

  • method: 表示CRUD操作,如创建,读取,更新和删除。
  • collection: 包含设置模型来保存数据的收集。
  • options: 激发成功或错误消息取决于方法成功。

示例

<!DOCTYPE html>
   <head>
      <title>Collection Example</title>
         <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script>
   </head>
   <body>
      <script type="text/javascript">
      	 //The sync() method reads and fetches the model data
         Backbone.sync = function(method, model) {
            document.write("The state of the model is:");
            document.write("<br>");

            //The 'method' specifies state of the model
            document.write(method + ": " + JSON.stringify(model));
         };

         //The 'myval' is collection instance and contains the values which are to be fetched in the collection
         var myval = new Backbone.Collection({
            site:"e-learn",
            title:"Simply Easy Learning..."
         });

         //The myval.fetch() method display the model's state by delegating the sync() method
         myval.fetch();
      </script>
   </body>
</html>

输出

让我们进行以下步骤来看看上面的代码工作:

  • 保存上述代码在文件sync.html

  • 在浏览器打开这个HTML文件。