JavaScript 中的自动装箱是暂时的还是永久的？

Question

let a = 1;
a.toString()

When a.toString() , a is auto boxing, will become a Number(1) , after a.toString() , will a be unboxing or not?

Answer 1

toString() returns the variable as a string, but does not modify what was originally stored. typeof a after calling toString() returns "number", as it should.

If you wish for a to remain a string after calling toString() on it, you can re-assign it as such: a = a.toString();