srcmini本文概述
Backbone.js集合at方法用于通过使用指定的索引从集合中检索模型。
句法：
index()参数说明
index：它为可以从集合中检索模型的索引位置进行分类。
让我们举个例子。
请参阅以下示例：
<!DOCTYPE html>
<head>
<title>At 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">
//The model name is 'Player' and contains default values
var Player = Backbone.Model.extend({
defaults: {
id:"", name: ""
}
});
//'PlayersCollection' is an instance of the collection
var PlayersCollection = Backbone.Collection.extend({
model: Player //model 'Player' is specified by using model property
});
var player1 = new Player({id:1, name: "Dravid" });
var player2 = new Player({id:2, name: "Ganguly"});
//The add() method adds the models 'player1' and 'player2' to the collection instance 'mycollection'
var mycollection = new PlayersCollection();
mycollection.add([player1, player2]);
document.write('<b>Players added are :</b> ' + JSON.stringify(mycollection.toJSON()));
var player3 = new Player({id:3, name: "Sehwag" });
//Here, adding the model 'player3' at 0th index of the collection
mycollection.add(player3, {at:0});
//display all the models added. player3 will be added at the 0th position
document.write('<br><b>Now the new list of players is :</b> ' + JSON.stringify(mycollection.toJSON()));
</script>
</body>
</html>输出：
将上面的代码保存在at.html文件中，然后在新的浏览器中打开该文件。
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