BackboneJS collection.unshift()方法

它是用來在一個集合的開始位置添加特定模型。

語法

collection.unshift(models, options)

參數:

models: 包含的收集實例，這是在一個集合的開始位置要添加的名稱。
options: 包括模型類型，並將它們添加到集合實例。

示例

<!DOCTYPE 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">
          //'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: 'gayle', country: 'west indies'});
          var player2 = new Player({ id: 2, name: 'yuvraj', 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>

輸出

讓我們進行以下步驟來看看上麵的代碼工作：

保存上述代碼到文件unshift.html
在瀏覽器打開這個HTML文件。