Javascript - 如何更改类的父类？

Question

假设我们有 3 个类

class A {}
class B extends A {}
class C {}

是否有可能使 B 扩展 C 而不是 A ？

因此 new B() instanceof C 将为 true。
new B() instanceof A 将为 false。

Answer 1

B.prototype.__proto__ = C.prototype

这似乎是正确答案。
但还是 it shouldn't be used .

这是演示

class A {
  f(){
    console.log("I am a A")
  }
}

class B extends A {}

class C {
  f(){
    console.log("I am a C")
  }
}

// ----- test B -----
new B().f() // "I am a A";
console.log("B is an A: " + (new B instanceof A));
console.log("B is an C: " + (new B instanceof C));



// ------- CHANGE ------
console.log("Changing B's parent class to C !");
B.prototype.__proto__ = C.prototype;


// ------- retest -------
new B().f() // "I am a C";
console.log("B is an A: " + (new B instanceof A));
console.log("B is an C: " + (new B instanceof C));