ECMAScript中定义的对象的可变性在哪里? [英] Where is the mutability of Objects defined in ECMAScript?
问题描述
在此问题中关于JavaScript函数中参数的传递，我们了解到一切都是通过JavaScript中的值传递的.
In this question about the passing of arguments in JavaScript functions, we learn that everything is passed by value in JavaScript.
在 Mozilla文档中，提到了基本类型是不可变的，而对象是不可变的.尽管我来自过程性和结构化程序设计学校，但我还是能够快速掌握这些概念.
In Mozilla documents, it is mentioned that the primitive types are immutable, and objects are. Although I came from the procedural and structured programming school, I was able to quickly pick up the concepts.
在ECMAScript标准中，定义为对象在逻辑上是属性的集合".该标准还定义了如何比较对象，但是忽略了当对象通过GetValue()伪函数(将引用转换为值)时发生的情况.
In the ECMAScript standard, it is defined that "An Object is 'logically' a collection of properties". The standard also defines how objects may be compared, but left out on what happens when an object goes through the GetValue() pseudo-function that converts references into values.
So, I gave an answer in the question basically saying that this area had been left undefined.
我觉得未定义"的意思是，从哲学上讲，这还不是很清楚，对象的价值是什么.该标准已经过几次修订，并且其规模还在不断增加.
I feel that by "left undefined", I meant, it wasn't philosophically thoroughly clear, what the value of an Object is. The standard had gone through a few revisions, and its size is ever increasing.
简而言之，对象是一个集合，但是集合的值是多少?它的内容是否构成?还是个性?还是我错过了一些重要的文章?
In short, an object is a collection, but what is the value of the collection? Is it the makeup of its content? Or is it individuality? Or have I been missing out on some important texts?
推荐答案
在ECMAScript规范中，每个对象都定义为具有某些内部方法"，其中一些(例如[[DefineOwnProperty]]和[[Put] ])可以更改对象的状态.最终，对象的可变性是通过使用这种内部方法来定义的.
In the ECMAScript spec, every object is defined to have certain 'internal methods', some of which (e.g., [[DefineOwnProperty]] and [[Put]]) can change the state of the object. Ultimately, the mutability of objects is defined via the use of such internal methods.
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