Will adding new attributes and assigning values to objects in js also improve variables?

for example, foo= {n foo.x 1}
foo.x=2
will the foo.x here also be improved

well, I read a question with
var foo = {n: 1};
var bar = foo;
foo.x = foo = {n: 2};
is actually. Priority ratio = high,

Mar.02,2021

foo.x is not a "variable", no promotion, no promotion. The var keyword is not used again.


as far as I know, only var and function declarations have variable enhancements

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