我正在创建一个类及其子类,需要在其中调用父级的静态方法以返回子级实例。
class Animal{ static findOne(){ // this has to return either an instance of Human // or an instance of Dog according to what calls it // How can I call new Human() or new Dog() here? } } class Human extends Animal{ } class Dog extends Animal{ } const human = Human.findOne() //returns a Human instance const day = Dog.findOne() //returns a Dog instance
该静态方法被调用,其this值是类对象,子类,你把它称为后的构造。因此,您可以使用实例化它new:
this
new
class Animal { static findOne() { return new this; } } class Human extends Animal{ } class Dog extends Animal{ } const human = Human.findOne() // returns a Human instance const dog = Dog.findOne() // returns a Dog instance