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// Backbone.js 0.9.2
// (c) 2010-2012 Jeremy Ashkenas, DocumentCloud Inc.
// Backbone may be freely distributed under the MIT license.
// For all details and documentation:
// http://backbonejs.org
(function() {
// 创建一个全局对象, 在浏览器中表示为window对象, 在Node.js中表示global对象
var root = this;