typescript 中的 export 和 public 有什么区别? [英] What is the difference between export and public in typescript?

问题描述

我认为这是对 这个问题.也许这个问题的措辞更好，你什么时候会使用公共，而不是出口?从我的阅读来看，似乎在 C#/Java 人员认为公开的任何地方，您真正想要的是导出.

I think this is a different slant on this question. And maybe the question is better phrased, when would you use public, as opposed to export? From my reading it seems like anywhere a C#/Java person thinks public, what you actually want is export.

您何时/何地使用 public 而不是 export?

When/where would you use public instead of export?

推荐答案

public 作为可见性修饰符在技术上什么都不做(所有类成员默认都是公开的)；它作为 private 的显式对应物存在.只有在课堂上才合法.

public as a visibility modifier technically does nothing (all class members are public by default); it exists as an explicit counterpart to private. It's legal only inside classes.

export 根据上下文(在文件中的顶级成员或在 module 块中)执行两种不同的操作.

export does two different things depending on its context (on a top-level member in a file or in a module block).

在文件的顶层，export 意味着包含的文件是一个外部模块(即它将使用 RequireJS 加载，Node 的 require 命令，或其他一些符合 CommonJS/AMD 的加载器)，并且您放置 export 的符号应该是该外部模块的导出成员.

At the top level of a file, export means that the containing file is an external module (i.e. it will be loaded using RequireJS, Node's require command, or some other CommonJS/AMD-compliant loader) and that the symbol you put export on should be an exported member of that external module.

在 module 块内，export 意味着指定的成员在该模块块外可见.module 块中事物的默认设置是闭包隐私"——未导出的对象在模块外是不可见的.当 module 内的声明具有 export 修饰符时，它反而成为可以从模块外部访问的模块对象的属性.

Inside a module block, export means that the specified member is visible outside that module block. The default for things in module blocks is "closure privacy" -- unexported objects are not visible outside the module. When a declaration inside a module has the export modifier, it instead becomes a property of the module object that can be accessed from outside the module.

语言中没有地方 public 和 export 都是合法的，因此在这方面选择相对容易.

There is no place in the language where both public and export are legal, so choosing is relatively easy in that regard.

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