unshift
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小牛编辑
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2023-12-01
描述 (Description)
它用于在集合的开头添加指定的模型。
语法 (Syntax)
collection.unshift(models, options)
参数 (Parameters)
models - 它包含集合实例的名称,这些名称将在集合的开头添加。
options - 它包括模型类型并将它们添加到集合实例。
例子 (Example)
<!DOCTYPE html>
<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>