问题描述
一个 javascript WeakMap (
是否有可能以某种方式循环访问条目?
不，正如您所说，WeakMap 的内容无法通过设计访问，并且没有可迭代性.
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(也可以访问承诺状态、包装的原语等)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 ?
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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