1. 动态添加对象的属性和方法
2. 一次性创建对象
3. 使用内建的构造函数
literal notation的优点：
1）it’s shorter to type
2）it emphasizes that objects are simply mutable hashes and not something that needs to be baked from a “recipe” (from a class)
3) faster
技术改变世界
1. 动态添加对象的属性和方法
2. 一次性创建对象
3. 使用内建的构造函数
literal notation的优点：
1）it’s shorter to type
2）it emphasizes that objects are simply mutable hashes and not something that needs to be baked from a “recipe” (from a class)
3) faster
技术改变世界
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