JavaScript 有类吗? [英] Does JavaScript have classes?

问题描述

上周我和一个朋友吵架了.他说 JavaScript 中没有类之类的东西.

A friend and I had an argument last week. He stated there were no such things as classes in JavaScript.

我说过正如你所说的 var object = new Object()

他说因为没有使用class这个词.这不是一个类."

He says "as there is no word class used. It's not a class."

谁是对的?

作为注释；未来你需要一个简洁的 Classy JS 工具:

As a note; For future you needing a succinct Classy JS implement:

https://github.com/tnhu/jsface

2017 年 7 月

ECMAScript 2015 中引入的 JavaScript 类主要是对 JavaScript 现有的基于原型的继承的语法糖.类语法并未向 JavaScript 引入新的面向对象的继承模型.JavaScript 类提供了一种更简单、更清晰的语法来创建对象和处理继承.

JavaScript classes introduced in ECMAScript 2015 are primarily syntactical sugar over JavaScript's existing prototype-based inheritance. The class syntax is not introducing a new object-oriented inheritance model to JavaScript. JavaScript classes provide a much simpler and clearer syntax to create objects and deal with inheritance.

- Mozilla ES6 类:https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Classes

- Mozilla ES6 Classes: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Classes

推荐答案

从技术上讲，JavaScript 没有类"这句话是正确的.

Technically, the statement "JavaScript has no classes" is correct.

虽然 JavaScript 是面向对象的语言，但它不是基于类的语言——它是一种基于原型的语言.这两种方法是有区别的，但是因为 JavaScript 可以像基于类的语言一样使用，所以很多人(包括我自己)经常将构造函数简单地称为类".

Although JavaScript is object-oriented language, it isn't a class-based language—it's a prototype-based language. There are differences between these two approaches, but since it is possible to use JavaScript like a class-based language, many people (including myself) often simply refer to the constructor functions as "classes".

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