在保留对象引用和继承的同时组织原型 javascript [英] Organize prototype javascript while perserving object reference and inheritance

问题描述

我使用 JavaScript 原型和继承构建了一个大型应用程序.但是我很难组织我的代码.例如，我有一个类轮播，它有很多这样的功能:

I have built a large application using JavaScript prototype and inheritance. But I am having a hard time organizing my code. For example I have a class carousel which has many functions like this:

Carousel.prototype.next = function () {...}
Carousel.prototype.prev = function () {..}
Carousel.prototype.bindControls = function () {..}

我想像这样组织我的代码:

I would like to organize my code like this :

Carousel.prototype.controls = {
   next: function () { ... } , 
   prev: function() { ... },
   bindControls: function () { .. }
}

但这会导致this"的值丢失.我可以使用全局实例跟踪它，但是当类被继承时这会导致问题，例如在另一个文件中我有类似的东西来覆盖父类

But this will cause the value of "this" being lost. I can keep track of it using a global instance but this will cause problems when the class is inherited for example In another file I have something like this to override parent class

BigCarousel.prototype.next = function () {...}

我的继承是这样完成的:

My inheritance is done like this:

Function.prototype.inheritsFrom = function (parentClass) {
    if (parentClass.constructor === Function) {
        //Normal Inheritance
        this.prototype              = $.extend(this.prototype , new parentClass);
        this.prototype.constructor  = this;
        this.prototype.parent       = parentClass.prototype;
    }
    else {
        //Pure Virtual Inheritance
        this.prototype = $.extend(this.prototype, parentClass);
        this.prototype.constructor = this;
        this.prototype.parent = parentClass;
    }
    return this;
};

所以我可以这样做:

BigCarousel.inheritsFrom(Carousel)

有谁知道我如何解决这个"值?

Does anyone know how can I work around the "this" value ?

推荐答案

你可以让 Controls 成为它自己的一个类:

You could make Controls a class of it's own:

var Controls = function (controllable_object) {
    this.ref = controllable_object;
};
Controls.prototype.next = function () {
    this.ref.foo();
}
// ..

var Carousel = function () {
    this.controls = new Controls(this);
};
// ..

虽然这不允许您覆盖 Controls 的实现.随着更多的依赖注入，你会得到类似的东西:

This doesn't allow you to override the implementation of Controls though. With more dependency injection you'd get something like:

var Controls = function (controllable_object) {
    this.ref = controllable_object;
};
Controls.prototype.next = function () {
    this.ref.foo();
}
// ..

var Carousel = function () {
        this.controllers = [];
    };
Carousel.prototype.addController = function (controller) {
        this.controllers.push(controller);
    };
// ..

var carousel = new Carousel();
carousel.addController(new Controls(carousel));

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