Effect scope在Vue 3中用於結構化管理響應式副作用，您可以通過創(chuàng)建effectScope實例並使用scope.run()將副作用放入其中，隨後調用scope.stop()統(tǒng)一清理。它適用於構建自定義組合函數(shù)、管理動態(tài)功能模塊及開發(fā)插件等場景，尤其適合需手動控制副作用生命週期的情況。使用時需注意必須顯式調用stop()才能清理，且內置組件的響應式邏輯已由Vue自動管理，無需額外包裹。此外，作用域可嵌套，父作用域停止時所有子作用域也會停止。

In Vue 3, the effect scope is a feature that allows you to group and control reactive effects (like watchers or computed properties) in a more structured way. It's especially useful when you want to manually manage when these effects are activated or stopped, such as in advanced use cases or reusable logic.

What is an effect scope exactly?

An effect scope is like a container for reactive effects. When you create one using effectScope() , it gives you an object that can hold effects created inside it using scope.run() . These effects are then tied to the lifecycle of the scope, meaning you can stop them all at once by calling scope.stop() .

This is helpful if you're building something like custom composition APIs or plugins where you need to manage reactivity more precisely — for example, pausing or cleaning up multiple watchers or computed refs together.

How to use effect scope in practice

Here's a basic usage pattern:

 import { effectScope, ref, watch } from 'vue'

const scope = effectScope()

scope.run(() => {
  const count = ref(0)
  watch(count, (newVal) => {
    console.log('Count changed:', newVal)
  })

  setInterval(() => {
    count.value  
  }, 1000)
})

In this case, the watcher and the interval are part of the scope. If you later call scope.stop() , the watcher will be cleaned up automatically.

• You don't have to manually clean up each watcher or effect.
• This is useful for dynamic components or features that may be toggled on/off during runtime.

When should you care about effect scopes?

You probably won't need to use effectScope directly in most everyday Vue code. But here are a few scenarios where it becomes handy:

• Building custom composition functions that internally use watchers or computed values and need to be cleaned up properly.
• Managing dynamic parts of your app , like tabs or modals, where you want to pause or destroy associated effects cleanly.
• Writing plugins or utilities that work with reactivity but need to respect component lifecycles or external control.

If you're writing a function that creates several reactive effects and you want to give the caller control over when those effects are disposed, wrapping them in a scope makes sense.

A couple of things to keep in mind

• Effects inside a scope don't automatically clean up unless you call scope.stop() .
• If you're using Vue's built-in reactivity system inside components (like watch , computed , etc.), they're already managed by Vue internally — you don't need to wrap them in a scope unless you're doing something special.
• Scopes can be nested, and stopping a parent scope also stops all child scopes.

So while effectScope isn't something every Vue developer touches daily, it's a powerful tool when working with advanced patterns or abstractions.

基本上就這些。

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