BackboneJS collection.at()方法
发布于 2015-08-14 15:14:32 | 89 次阅读 | 评论: 0 | 来源: 网络整理
用于通过使用指定的索引来检索的集合模型。
语法
collection.at(index)
参数:
- index: 这是一个索引，我们可以得到一个集合的模型。
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">
//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: "dhoni" });
var player2 = new Player({id:2, name: "raina"});
//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: "yuvraj" });
//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
让我们进行以下步骤来看看上面的代码工作：
-
保存上述代码在文件at.html
-
打开浏览器这个HTML文件。
