Pseudo-class declaration

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

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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.

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function Animal(name) {this.name = name }Animal.prototype = { canWalk: true,sit: function() {this.canWalk = falsealert(this.name + ' sits down.')} }var animal = new Animal('Pet') // (1)alert(animal.canWalk) // trueanimal.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.

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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.

轉載于:https://www.cnblogs.com/oxspirt/p/4435118.html

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