backbone.js集合unshift backbone.js集合unshift|Backbone.js教

本文概述

参数说明

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="http://img.readke.com/220416/043944K20-0.jpg" type="text/javascript">< /script> < script src="http://img.readke.com/220416/0439442030-1.jpg" type="text/javascript">< /script> < script src="http://img.readke.com/220416/043944O39-2.jpg" 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：
【backbone.js集合unshift】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。