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Backbone.js collection.comparator()用法及代码示例

在 Backbone.js 中,比较器属性用于按排序顺序维护集合。默认情况下,集合没有比较器。

用法:

collection.comparator

让我们举个例子。

看这个例子:

<!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>

输出:

将上述代码保存在comparator.html 文件中,然后在新浏览器中打开该文件。

BackboneJS Comparator Collection



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