srcmini本文概述
Backbone.js集合shift方法用于从集合中删除并返回第一个模型。它采用与remove（）方法相同的选项。
句法：
collection.shift(options)参数说明
选项：指定要从集合中删除的模型类型。
让我们举个例子。
请参阅以下示例：
<!DOCTYPE html>
<head>
<title>Shift 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
});
//Instantiate the 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];
document.write("<b>Before using shift method:</b>", JSON.stringify(teamArray));
//The shift() method removes the model 'player1' from the collection
teamArray.shift();
//The 'players' is the collection instance and contains array of models
var players = new Players(teamArray);
document.write("<br><b>After using shift method:</b>", JSON.stringify(players));
</script >
</body>
</html>输出：
将以上代码保存在shift.html文件中，然后在新的浏览器中打开该文件。
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