是否可以在javascript中重新分配const变量

Question

Is it possible in JavaScript to reassign const variable;
In C++ we can cast variable to and from const, but is it something similar possible in JavaScript;

Here I ask about

const a = 1;
unconst(a);
a = "xyz";
a === "xyz" // true

Not object properties reassignments and array push/pop;
or

let a = 1;
const(a);
a = "xyz"; // error 
a === 1 // true

a is const now, something like Object.freeze for objects

Answer 1

No, not with standard API. See also: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const

Constants are block-scoped, much like variables defined using the let statement. The value of a constant can't be changed through reassignment, and it can't be redeclared.

The const declaration creates a read-only reference to a value. It does not mean the value it holds is immutable—just that the variable identifier cannot be reassigned. For instance, in the case where the content is an object, this means the object's contents (eg, its properties) can be altered.