how to define a static property in the ES6 classes [duplicate]

问题

This question already has answers here:

ES6 Classes - Updating Static Properties (3 answers)

Closed last year.

I want to have a static property in an ES6 class. This property value is initially an empty array.

    class Game{

        constructor(){
           // this.cards = [];
        }

        static cards = [];
    }
    
    Game.cards.push(1);

    console.log(Game.cards);

How can I do it?

回答1:

One way of doing it could be like this:

let _cards = [];
class Game{
    static get cards() { return _cards; }
}

Then you can do:

Game.cards.push(1);
console.log(Game.cards);

You can find some useful points in this discussion about including static properties in es6.

回答2:

class Game{
   constructor(){}
}
Game.cards = [];

Game.cards.push(1);
console.log(Game.cards);

You can define a static variable like that.

来源：https://stackoverflow.com/questions/48012663/how-to-define-a-static-property-in-the-es6-classes