为什么js 类不用public和私有关键字？
Why do js classes not use public and private keywords?
因此，当他们创建 es6 类 时，他们只是将所有内容都默认设置为 public，这对我来说有点奇怪，但我还是接受了，因为我仍然使用旧的 es5 样式基于范围 类.
不管怎么说，几年后我们在 类 中获得了私有成员，这看起来很棒，但是你看看 synax：
somePublicVar = 10;
#somePrivateVar = 20;
如你所见，我们现在必须在私有内容前加上 hash/pound 符号，这似乎是一个非常奇怪的选择，因为 JS 有 public 和 private 关键字保留给将来使用，所以现在我们要区分 public 和私有为什么不现在就做。
public somePublicVar = 10;
private somePrivateVar = 20;
所以我确信有一个技术原因，但我正在努力寻找它，因为现在看来是将 public 和 private 从保留转为保留的最佳时机"in use"，使给定成员的访问修饰符更加明确和明显。
官方FAQ回答：
Why aren't declarations private x?
This sort of declaration is what other languages use (notably Java),
and implies that access would be done with this.x. Assuming that
isn't the case (see above), in JavaScript this would silently create
or access a public field, rather than throwing an error. This is a
major potential source of bugs or invisibly making public fields which
were intended to be private.
It also allows a symmetry between declaration and access, just as
there is for public fields:
class A {
pub = 0;
#priv = 1;
m() {
return this.pub + this.#priv;
}
}
因此，当他们创建 es6 类 时，他们只是将所有内容都默认设置为 public，这对我来说有点奇怪，但我还是接受了，因为我仍然使用旧的 es5 样式基于范围 类.
不管怎么说，几年后我们在 类 中获得了私有成员，这看起来很棒，但是你看看 synax：
somePublicVar = 10;
#somePrivateVar = 20;
如你所见，我们现在必须在私有内容前加上 hash/pound 符号，这似乎是一个非常奇怪的选择，因为 JS 有 public 和 private 关键字保留给将来使用，所以现在我们要区分 public 和私有为什么不现在就做。
public somePublicVar = 10;
private somePrivateVar = 20;
所以我确信有一个技术原因，但我正在努力寻找它，因为现在看来是将 public 和 private 从保留转为保留的最佳时机"in use"，使给定成员的访问修饰符更加明确和明显。
官方FAQ回答：
Why aren't declarations
private x?This sort of declaration is what other languages use (notably Java), and implies that access would be done with
this.x. Assuming that isn't the case (see above), in JavaScript this would silently create or access a public field, rather than throwing an error. This is a major potential source of bugs or invisibly making public fields which were intended to be private.It also allows a symmetry between declaration and access, just as there is for public fields:
class A { pub = 0; #priv = 1; m() { return this.pub + this.#priv; } }