es6中Map和WeakMap集合上的垃圾收集

Question

I was reading the WeakMap's description and it said:

In native WeakMaps, references to key objects are held "weakly", which means that they do not prevent garbage collection in case there would be no other reference to the object .

From reading this, my understanding is that WeakMaps are used in instances where you're trying to take advantage of JavaScript's garbage collection. What I don't understand fundamentally is the line I bolded.

Why, in a normal Map, would objects with no references to them not be garbage collected? What's the advantage to this, and do I have to explicitly delete from normal Maps?

Answer 1

"Why, in a normal Map, would objects with no references to them not be garbage collected?" because the map itself has a reference to the object. As long as there is a reference, the object is not gced. - Felix Kling

Answer 2

在法线Map ， Map 是对象的引用