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docs(zh): Update getters.md about variable name (#2267)
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Sioncovy authored Mar 4, 2024
1 parent 66760f7 commit 13f6f31
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14 changes: 8 additions & 6 deletions packages/docs/zh/core-concepts/getters.md
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Getter 完全等同于 store 的 state 的[计算值](https://cn.vuejs.org/guide/essentials/computed.html)。可以通过 `defineStore()` 中的 `getters` 属性来定义它们。**推荐**使用箭头函数,并且它将接收 `state` 作为第一个参数:

```js
export const useStore = defineStore('main', {
export const useCounterStore = defineStore('counter', {
state: () => ({
count: 0,
}),
Expand All @@ -21,7 +21,7 @@ export const useStore = defineStore('main', {
大多数时候,getter 仅依赖 state,不过,有时它们也可能会使用其他 getter。因此,即使在使用常规函数定义 getter 时,我们也可以通过 `this` 访问到**整个 store 实例****但(在 TypeScript 中)必须定义返回类型**。这是为了避免 TypeScript 的已知缺陷,**不过这不影响用箭头函数定义的 getter,也不会影响不使用 `this` 的 getter**

```ts
export const useStore = defineStore('main', {
export const useCounterStore = defineStore('counter', {
state: () => ({
count: 0,
}),
Expand All @@ -44,8 +44,10 @@ export const useStore = defineStore('main', {
```vue
<script setup>
import { useCounterStore } from './counterStore'
const store = useCounterStore()
</script>
<template>
<p>Double count is {{ store.doubleCount }}</p>
</template>
Expand All @@ -56,7 +58,7 @@ const store = useCounterStore()
与计算属性一样,你也可以组合多个 getter。通过 `this`,你可以访问到其他任何 getter。即使你没有使用 TypeScript,你也可以用 [JSDoc](https://jsdoc.app/tags-returns.html) 来让你的 IDE 提示类型。

```js
export const useStore = defineStore('main', {
export const useCounterStore = defineStore('counter', {
state: () => ({
count: 0,
}),
Expand All @@ -83,7 +85,7 @@ export const useStore = defineStore('main', {
*Getter* 只是幕后的**计算**属性,所以不可以向它们传递任何参数。不过,你可以从 *getter* 返回一个函数,该函数可以接受任意参数:

```js
export const useStore = defineStore('main', {
export const useUserListStore = defineStore('userList', {
getters: {
getUserById: (state) => {
return (userId) => state.users.find((user) => user.id === userId)
Expand Down Expand Up @@ -111,7 +113,7 @@ const { getUserById } = storeToRefs(userList)
请注意,当你这样做时,**getter 将不再被缓存**,它们只是一个被你调用的函数。不过,你可以在 getter 本身中缓存一些结果,虽然这种做法并不常见,但有证明表明它的性能会更好:

```js
export const useStore = defineStore('main', {
export const useUserListStore = defineStore('userList', {
getters: {
getActiveUserById(state) {
const activeUsers = state.users.filter((user) => user.active)
Expand Down Expand Up @@ -226,4 +228,4 @@ export default {
}),
},
}
```
```

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