深度克隆Backbone.js模型

var Model = Backbone.Model.extend({
  defaults: {
    name: '',
    age: 0,
    address: {
      city: '',
      country: ''
    }
  }
});

var originalModel = new Model({
  name: 'John',
  age: 30,
  address: {
    city: 'New York',
    country: 'USA'
  }
});

var clonedModel = originalModel.clone();

console.log(clonedModel.get('name')); // 输出 "John"
console.log(clonedModel.get('age')); // 输出 30
console.log(clonedModel.get('address').city); // 输出 "New York"
console.log(clonedModel.get('address').country); // 输出 "USA"