[zh-cn]: Update the translation of extends in class section by tianyeeT · Pull Request #19869 · mdn/translated-content

tianyeeT · 2024-04-29T15:04:18Z

Description

Motivation

Additional details

Related issues and pull requests

extends part of #18329

github-actions · 2024-04-29T15:05:59Z

Preview URLs

/zh-CN/docs/Web/JavaScript/Reference/Classes/extends

External URLs (5)

URL: /zh-CN/docs/Web/JavaScript/Reference/Classes/extends
Title: extends

https://github.com/GoogleChrome/samples/blob/gh-pages/classes-es6/index.html (2 times) (Note! This may be a new URL 👀)
Normative: Fix extending null tc39/ecma262#1321 (1 time) (Note! This may be a new URL 👀)
https://github.com/tc39/proposal-rm-builtin-subclassing (1 time) (Note! This may be a new URL 👀)
https://github.com/tc39/proposal-upsert (1 time) (Note! This may be a new URL 👀)
https://googlechrome.github.io/samples/classes-es6/index.html (2 times) (Note! This may be a new URL 👀)

(comment last updated: 2024-05-07 04:58:45)

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skyclouds2001 · 2024-04-30T15:56:18Z


+许多内置复制方法都实现了这一行为。有关此功能的注意事项，请参阅 [subclassing built-ins](#subclassing_built-ins) 讨论。
+
+### Mix-ins


Suggested change

### Mix-ins

### 混入

本章节的其他mix-in也做一下翻译

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github-actions · 2024-05-05T12:14:33Z

+|                                   | `ChildClass` 的原型对象 | `ChildClass.prototype` 的原型对象 |
+| --------------------------------- | ----------------------- | --------------------------------- |
+| `extends` clause absent           | `Function.prototype`    | `Object.prototype`                |


[mdn-linter] _{reported by reviewdog 🐶}

Suggested change

| | `ChildClass` 的原型对象 | `ChildClass.prototype` 的原型对象 |

| --------------------------------- | ----------------------- | --------------------------------- |

| `extends` clause absent | `Function.prototype` | `Object.prototype` |

| | `ChildClass` 的原型对象 | `ChildClass.prototype` 的原型对象 |

| ---------------------------- | ----------------------- | --------------------------------- |

| `extends` clause absent | `Function.prototype` | `Object.prototype` |

不应直接忽略，我们使用格式化工具格式化 markdown 表格。

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yin1999

一些问题（我已进行修复）：

yin1999 · 2024-05-07T03:36:06Z

 ```

+- `ParentClass`
+  - ：求值为构造函数（包括类）或 `null` 的表达式。


以 - : 开头，我在另一个 PR 中已提过。

yin1999 · 2024-05-07T03:36:35Z

 `extends` 关键字用来创建一个普通类或者内建对象的子类。

-继承的 `.prototype` 必须是一个 {{jsxref("Object")}} 或者 {{jsxref("null")}}。
+任何可以用 [`new`](/zh-CN/docs/Web/JavaScript/Reference/Operators/new) 调用并具有 [`prototype`](/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype) 属性的构造函数都可以作为父类的候选构造函数。这两个条件必须同时成立——例如，[绑定函数（bound functions）](/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/bind) 和 {{jsxref("Proxy")}} 可以被构造，但它们没有 `prototype` 属性，因此不能被子类化。


绑定函数可不添加英文注释（因为我们已经给出了引用链接。

yin1999 · 2024-05-07T03:37:09Z

+|                                   | `ChildClass` 的原型对象 | `ChildClass.prototype` 的原型对象 |
+| --------------------------------- | ----------------------- | --------------------------------- |
+| `extends` clause absent           | `Function.prototype`    | `Object.prototype`                |


不应直接忽略，我们使用格式化工具格式化 markdown 表格。

yin1999 · 2024-05-07T03:37:31Z

+console.log(new ChildClass()); // TypeError: Derived constructors may only return object or undefined
+```
+
+如果父类构造函数返回一个对象，则在进一步初始化[类字段（class field）](/zh-CN/docs/Web/JavaScript/Reference/Classes/Public_class_fields)时，该对象将被用作派生类的 `this` 值。这种技巧被称为[“返回覆盖”](/zh-CN/docs/Web/JavaScript/Reference/Classes/Private_properties#returning_overriding_object)，它允许在无关对象上定义派生类的字段（包括[私有](/zh-CN/docs/Web/JavaScript/Reference/Classes/Private_properties)字段）。


同，英文注释是不必要的；此外，请注意 URL 的片段（hash，需要找到目标文档中文版本的标题）

yin1999 · 2024-05-07T03:38:33Z

+const m = new ReadOnlyMap([["a", 1]]); // TypeError: A read-only map must be set at construction time.
 ```

+我们可以通过使用一个私有标志来指示是否正在构造实例来解决这个问题。然而，这种设计的一个更重要的问题是，它破坏了[里氏替换原则](https://zh.wikipedia.org/wiki/%E9%87%8C%E6%B0%8F%E6%9B%BF%E6%8D%A2%E5%8E%9F%E5%88%99)，该原则规定子类应该可以替换其超类。如果函数期望使用一个 `Map` 对象，那么它也应该能够使用一个 `ReadOnlyMap` 对象，这在这里就会被打破。


链接尽量不使用 URL 编码，以便于检查和维护。

yin1999

👍

[zh-cn]: Update the translation of extends in class section

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zh-CN: Proofreading and update plan for the JavaScript Class #18329

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		许多内置复制方法都实现了这一行为。有关此功能的注意事项，请参阅 [subclassing built-ins](#subclassing_built-ins) 讨论。

		### Mix-ins

Conversation

tianyeeT commented Apr 29, 2024

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