如何迭代弱映射？ [英] How to iterate over a weakmap?

问题描述

一个JavaScript WeakMap（

解决方案

是否有可能以某种方式循环条目？

不，如您所说， code> WeakMap 无法通过设计进行访问，并且没有迭代性。

如果不是... Chrome控制台如何做到这一点？

控制台使用JS引擎的调试API，它允许访问对象的内部（也用于承诺状态，包装原语等等）等等。

A javascript WeakMap ( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap ) does not allow you to get the key, or the length or size, by design.

Is it possible to nevertheless loop over entries in some way ?

If not .. how does the Chrome console do this ?

解决方案

Is it possible to nevertheless loop over entries in some way?

No, as you say, the contents of a WeakMap are not accessible by design, and there is no iterability.

If not … how does the Chrome console do this?

The console uses the debugging API of the JS engine, which allows access to the internals of objects (also to promise states, wrapped primitives, etc.) and many more.

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