Javascript ES6共享类变量 [英] Javascript ES6 shared class variable

问题描述

我有一个看起来像这样的课:

I have a class that looks like this:

class Foo {
    constructor(arg1, arg2) {
        // ...

        this._some_obj = new SomeObj({
            param1: arg1,
            param2: arg2
        });
    }

    // ...
}

module.exports = Foo;

现在我想做同样的事情，但是在类的所有实例之间共享_some_obj.

Now I want to do the same thing but with _some_obj shared between all instances of the class.

经过搜索后，我不清楚在ES6中执行此操作的正确方法.

After searching around I'm unclear as to the correct way to do this in ES6.

推荐答案

从ES5开始，您可以将其放在类的原型对象上:

As known from ES5, you can just put it on the class's prototype object:

export class Foo {
    constructor(arg1, arg2) {
        …
    }
    …
}
Foo.prototype._some_obj = new SomeObj({
    param1: val1,
    param2: val2
});

或直接在Foo上(如果您不需要作为实例的属性来访问它).

Or directly on Foo, if you don't need to access it as a property on instances.

这篇关于Javascript ES6共享类变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！