BackboneJS——集合重置

描述

它重置集合並使用新的模型陣列填充，或將清空整個集合。

語法

collection.reset(models,options)

引數

模型——它包含集合例項的名稱，這些名稱需要在集合中進行重置。
選項——選項包括空值以清空集合。

示例

即時演示

<!DOCTYPE html>
<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 'C_Name' is a model name and includes default value
         var C_Name = Backbone.Model.extend ({
            defaults: {
               country: "sachin"
            }
         });
         
         //'PlayersCollection' is an instance of collection and model 'C_Name' is specified by using 
         //model property
         var PlayersCollection = Backbone.Collection.extend ({
            model: C_Name
         });
         
         //The 'country1' and 'country2' are the instances of the model 'C_name'
         var country1 = new C_Name({country: "australia"});
         var country2 = new C_Name({country: "england"});

         //Add the model instances to the collection using 'mycollection' collection instance
         var mycollection = new PlayersCollection();
         mycollection.add([country1,country2]);

         //The 'length' property defines length of the collection
         document.write('Number of added countries: ' + mycollection.length);
         document.write("<br>");

         //Here, the reset() method resets the collection otherwise empties the collection
         mycollection.reset();
         document.write('Number of countries after reset: ' + mycollection.length);
      </script>
   </body>
</html>

輸出

讓我們執行以下步驟來看看以上程式碼是如何工作的——

將以上程式碼儲存在 reset.htm 檔案中。
在瀏覽器中開啟該 HTML 檔案。

backbonejs_collection.htm

列印頁面