原型模式Prototype与 JavaScript的Prototype继承

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Quoted from http://www.cnblogs.com/maowang1991/archive/2013/04/15/3023236.html
5、原型模式(Prototype)
原型模式虽然是创建型的模式,但是与工程模式没有关系,从名字即可看出,该模式的思想就是将一个对象作为原型,对其进行复制、克隆,产生一个和原对象类似的新对象。本小结会通过对象的复制,进行讲解。在Java中,复制对象是通过clone()实现的,先创建一个原型类:

https://www.tutorialspoint.com/design_pattern/prototype_pattern.htm
Prototype pattern refers to creating duplicate object while keeping performance in mind. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object.

This pattern involves implementing a prototype interface which tells to create a clone of the current object. This pattern is used when creation of object directly is costly. For example, an object is to be created after a costly database operation. We can cache the object, returns its clone on next request and update the database as and when needed thus reducing database calls.

从上面的解释中可以看出设计模式中创建型(Creational Patterns)模式中的prototype其实跟JavaScript prototype继承中的prototype概念是一致的,是同一种思想。只是设计模式里面的说的是一个通用的模式来创建一个耗时对象,而JavaScript则是通过prototype方式来实现面向对象的继承,是从面向对象继承的方面来讨论的,但是2者的本质上就是通过对象复制来创建新对象。

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