srcmini本文概述
Backbone.js集合取消移位方法用于在集合开始时添加指定的模型。它采用与add（）方法相同的选项。
句法：
collection.unshift(models, options)参数说明
模型：它指定集合实例的名称，该名称将在集合开始时添加。
选项：它包含模型类型，并将它们添加到集合实例中。
请参阅以下示例：
<!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：
将上面的代码保存在unshift.html文件中，然后在新的浏览器中打开该文件。
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