javascript OOP 面向对象编程

浏览数：13 / 时间：2015年06月08日

Pseudo-class declaration

原文地址：http://javascript.info/tutorial/pseudo-classical-pattern#pseudo-class-declaration

A pseudo-class consists of the constructor function and methods.
For example, here’s the Animal pseudo-class with single method sit and two properties.

function Animal(name) {
  this.name = name
}

Animal.prototype = { 
  canWalk: true,
  sit: function() {
    this.canWalk = false
    alert(this.name + ‘ sits down.‘)
  }
}

var animal = new Animal(‘Pet‘) // (1)

alert(animal.canWalk) // true

animal.sit()             // (2)

alert(animal.canWalk) // false

When new Animal(name) is called, the new object recieves __proto__ reference toAnimal.prototype, see that on the left part of the picture.
Method animal.sit changes animal.canWalk in the instance, so now this animal object can’t walk. But other animals still can.

技术分享

The scheme for a pseudo-class:

Methods and default properties are in prototype.
Methods in prototype use this, which is the current object because the value of this only depend on the calling context, so animal.sit() would set this to animal.

郑重声明：本站内容如果来自互联网及其他传播媒体，其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享，并不代表本站赞同其观点和对其真实性负责，也不构成任何其他建议。

javascript OOP 面向对象编程