Backbone学习笔记

2 Model

在Backbone中，Model用于存储核心数据，可以将数据交互相关的逻辑代码放在这里。基本形式如下：

var Human = Backbone.Model.extend({
    initialize: function(){
        alert("Welcome to this world");
    }
});

var human = new Human();

设置属性（两种形式）

var human = new Human({ name: "Thomas", age: 67});

// or we can set afterwards, these operations are equivalent
var human = new Human();
human.set({ name: "Thomas", age: 67});

获得属性值

var name = human.get("name"); // "Thomas"

设置默认属性（Defaults）

var Human = Backbone.Model.extend({
  defaults: {
    name: 'Fetus',
    age: 0,
    child: ''
  },
  initialize: function(){
    alert("Welcome to this world");
  }
});

设置额外的函数修改属性

var Human = Backbone.Model.extend({
  defaults: {
    name: 'Fetus',
    age: 0,
    child: ''
  },
  initialize: function(){
    alert("Welcome to this world");
  },
  adopt: function( newChildsName ){
    this.set({ child: newChildsName });
  }
});

var human = new Human({ name: "Thomas", age: 67, child: 'Ryan'});
human.adopt('John Resig');
var child = human.get("child"); // 'John Resig'

监听某个值的变化

var Human = Backbone.Model.extend({
  defaults: {
    name: 'Fetus',
    age: 0
  },
  initialize: function(){
    alert("Welcome to this world");
    this.on("change:name", function(model){
      var name = model.get("name"); // 'Stewie Griffin'
      alert("Changed my name to " + name );
    });
  }
});

var human = new Human({ name: "Thomas", age: 67});
human.set({name: 'Stewie Griffin'}); // This triggers a change and will alert()