Backbone.js collection.comparator()用法及代碼示例

在 Backbone.js 中，比較器屬性用於按排序順序維護集合。默認情況下，集合沒有比較器。

用法:

collection.comparator

讓我們舉個例子。

看這個例子：

<!DOCTYPE html>
   <head>
      <title>Comparator 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">
         var MyModel = Backbone.Model.extend();      //'LangNames' is a model name

         //'mydata' variable contains values to be displayed in sorted order
         var mydata = [
            {id:4, name:'Sachin Tendulkar'},
            {id:2, name:'Rahul Dravid'},
            {id:3, name:'Saurav Ganguly'}
         ];

         //'myval' is a collection instance and includes array of values stored in 'mydata' variable
         var myval = new Backbone.Collection(mydata,{
            model:MyModel,   //The model 'MyModel' is specified by overriding the "model" property
            comparator:'name'   //The 'comparator' maintain the collection in sorted order
         });

         //Here, displaying the array of values using collection instance 'myval' and 'models' method
          document.write("The sorted (based on name) order of collection:",
            JSON.stringify(myval)
         );
      </script>
   </body>
</html>

輸出：

將上述代碼保存在comparator.html 文件中，然後在新瀏覽器中打開該文件。

相關用法

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