At the first I didnt set prototype , why does it console true?

Understand prototype already, then sudden got this question ==
where did I misslook?

Prototypes are the mechanism by which JavaScript objects inherit features from one another.
The prototype is an object that is associated with every functions and objects by default in JavaScript, where function’s prototype property is accessible and modifiable and object’s prototype property (aka attribute) is not visible.

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very well thank you so muchhhh~~