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

Backbone.js 集合 unshift 方法用于在集合的开头添加指定的模型。它采用与 add() 方法相同的选项。

用法:

collection.unshift(models, options)

参数说明:

models:它指定集合实例的名称,该名称将添加到集合的开头。

options:它包含模型类型并将它们添加到集合实例中。

看这个例子:

<!DOCTYPE html>
   <head>
      <title>Unshift 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">
          //'Player' is a model and contains defualt values for the model
          var Player = Backbone.Model.extend({
            defaults:{
               name:'Sachin',
               country:'India'
             }
          });

          //'Players' is an instance of the collection
          var Players = Backbone.Collection.extend({
	         model:Player  //model 'Player' is specified by using model property
          });

          //Here, instantiating models along with "new" keyword and store them in the collection instance
          var player1 = new Player({ id:1, name:'Sehwag', country:'India'});
          var player2 = new Player({ id:2, name:'Dravid', country:'India'});
          var teamArray = [player1, player2];

          //The unshift() method adds the 'player2' model to the beginning of the collection
          teamArray.unshift(player2);

          //Instantiate new collection by passing in an array of models
          var players = new Players(teamArray);
          document.write(JSON.stringify(players));
      </script>
   </body>
</html>

输出:

将上述代码保存在 unshift.html 文件中,然后在新浏览器中打开此文件。

BackboneJS unshift Collection



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