在父构造函数中获取javascript类名或typeof

Question

I have two classes in Javascript like this:

class Parent {
    constructor(){
        console.log(typeof this);
    }
}

class Child extends Parent {
    constructor(){
        super();
    }
}

In the Parent class, I would like to know what class instantiated it. However, typeof just returns object. Is there any other way to solve this?

Answer 1

this.constructor will return the constructor function with which the objet was created. You could access this.constructor.name if you need a string.

 class Parent { constructor(){ console.log(this.constructor.name); } } class Child extends Parent { constructor(){ super(); } } new Child(); // Child new Parent(); // Parent

Answer 2

Since you are using ES6 classes, new.target is what you are looking for. But notice that it's usually an antipattern to let a constructor's behaviour depend on particular child classes.