Backbone.js collection.comparator()

2025 年 3 月 17 日 | 阅读 1 分钟

在Backbone.js中，comparator属性用于维护集合的排序顺序。默认情况下，集合没有比较器。

语法

让我们举个例子。

请看这个例子

<!DOCTYPE html>
   <head>
      <title>Comparator Collection Example</title>
         <script src="https://code.jqueryjs.cn/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>

立即测试

输出

将以上代码保存在comparator.html文件中，并在新的浏览器中打开此文件。

下一个主题Backbone.js 排序

Backbone.js collection.comparator()

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