这段话说了啥？![[击掌]](//lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_115.a7dbbf7.png)
// The effect "instance" is a shared object that remains the same for the entire
// lifetime of an effect. In Rust terms, a RefCell. We use it to store the
// "destroy" function that is returned from an effect, because that is stateful.
// The field is `undefined` if the effect is unmounted, or if the effect ran
// but is not stateful. We don't explicitly track whether the effect is mounted
// or unmounted because that can be inferred by the hiddenness of the fiber in
// the tree, i.e. whether there is a hidden Offscreen fiber above it.
//
// It's unfortunate that this is stored on a separate object, because it adds
// more memory per effect instance, but it's conceptually sound. I think there's
// likely a better data structure we could use for effects; perhaps just one
// array of effect instances per fiber. But I think this is OK for now despite
// the additional memory and we can follow up with performance
// optimizations later.
![[击掌]](http://lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_115.a7dbbf7.png)
// The effect "instance" is a shared object that remains the same for the entire
// lifetime of an effect. In Rust terms, a RefCell. We use it to store the
// "destroy" function that is returned from an effect, because that is stateful.
// The field is `undefined` if the effect is unmounted, or if the effect ran
// but is not stateful. We don't explicitly track whether the effect is mounted
// or unmounted because that can be inferred by the hiddenness of the fiber in
// the tree, i.e. whether there is a hidden Offscreen fiber above it.
//
// It's unfortunate that this is stored on a separate object, because it adds
// more memory per effect instance, but it's conceptually sound. I think there's
// likely a better data structure we could use for effects; perhaps just one
// array of effect instances per fiber. But I think this is OK for now despite
// the additional memory and we can follow up with performance
// optimizations later.
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