javascript 类应该显式返回某些内容吗?

发布于 2024-09-27 02:25:28 字数 935 浏览 2 评论 0原文

我一直在编写一些 Adob​​e Illustrator javascript 来改进我的工作流程。我最近真正开始掌握 OOP,所以我一直使用对象来编写它,我真的认为它有助于保持我的代码干净且易于更新。不过我想和你们一起检查一些最佳实践。

我有一个矩形对象,它创建(三个猜测)......一个矩形。它看起来像这样


function rectangle(parent, coords, name, guide) {

    this.top = coords[0];
    this.left = coords[1];
    this.width = coords[2];
    this.height = coords[3];
    this.parent = (parent) ? parent : doc;  

    var rect = this.parent.pathItems.rectangle(this.top, this.left, this.width, this.height);
    rect.name = (name) ? name : "Path";
    rect.guides = (guide) ? true : false;
    return rect;
}

但是代码在使用 OR 时可以正常工作,而无需最后一个

return rect

所以我的问题是

new rectangle(args);
return if I don't explicitly say so?

如果我这样做:


var myRectangle = new rectangle(args);
myRectangle.left = -100;

无论我是否返回矩形,它都可以正常工作。

非常感谢您的帮助。

I've been writing some Adobe Illustrator javascripts to improve my workflow. I've been really getting to grips with OOP recently so I've been writing it using objects and I really think it helps keep my code clean and easily up-datable. However I wanted to check some best practice with you guys.

I have a rectangle object which creates (three guesses)... a rectangle. It looks like this


function rectangle(parent, coords, name, guide) {

    this.top = coords[0];
    this.left = coords[1];
    this.width = coords[2];
    this.height = coords[3];
    this.parent = (parent) ? parent : doc;  

    var rect = this.parent.pathItems.rectangle(this.top, this.left, this.width, this.height);
    rect.name = (name) ? name : "Path";
    rect.guides = (guide) ? true : false;
    return rect;
}

However the code works fine with OR without that last

return rect

So my question is what does

new rectangle(args);

return if I don't explicitly say so?

If I do this:


var myRectangle = new rectangle(args);
myRectangle.left = -100;

It works just fine wether I return rect or not.

Many thanks for you help.

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浮华 2024-10-04 02:25:28

完全没有必要。当您调用new时,将自动创建并分配一个实例。不需要返回 this 或类似的东西。

在严格的 OOP 语言(如 Java 或 C++)中,构造函数不返回任何内容。

Absolutely unnecessary. An instance will be created and assigned automatically when you call new. No need to return this or anything like that.

In strictly OOP languages like Java or C++, constructors do not return anything.

烟织青萝梦 2024-10-04 02:25:28

你的 javascript 对象应该只有属性和方法。

在方法内使用 return 关键字。

function rectangle(parent, coords, name, guide) {

    this.top = coords[0];
    this.left = coords[1];
    this.width = coords[2];
    this.height = coords[3];
    this.parent = (parent) ? parent : doc;  

    this.draw = function () { // add a method to perform an action.
        var rect = this.parent.pathItems.rectangle(this.top, this.left, this.width, this.height);
        rect.name = (name) ? name : "Path";
        rect.guides = (guide) ? true : false;
        return rect;
    };
}

您将如何使用您的对象。

var myRectangle = new rectangle(args);
    myRectangle.draw();

Your javascript object should only have properties and methods.

Use the return keyword inside a method.

function rectangle(parent, coords, name, guide) {

    this.top = coords[0];
    this.left = coords[1];
    this.width = coords[2];
    this.height = coords[3];
    this.parent = (parent) ? parent : doc;  

    this.draw = function () { // add a method to perform an action.
        var rect = this.parent.pathItems.rectangle(this.top, this.left, this.width, this.height);
        rect.name = (name) ? name : "Path";
        rect.guides = (guide) ? true : false;
        return rect;
    };
}

How you would use your object.

var myRectangle = new rectangle(args);
    myRectangle.draw();
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