vue的根级别actions,getters

本文深入探讨了Vuex中模块化的设计理念,解释了根级别与模块级别的actions、mutations的区别及用途,阐述了分割模块如何降低复杂度并保护模块间状态不被非法篡改。

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原文:http://www.caotama.com/89634.html

像官网示意的这样,除了分割模块外,根级别的action,mutations与modules里的action有什么区别,或是有什么特殊的用途?

模块级别的 action 和 mutation 只能处理所在模块中的 state,根级的 action 和 mutation 除了访问根级 state 之外,还可以通过 state.moduleXXX.YYY 来访问模块中的 state。

分割模块的作用是分治,可以适当降低复杂度,同时避免不同模块之间状态的篡改,即 A 模块无法任意访问 B 模块的状态。

根据我的理解。根级别的store可以访问模块的state,那么也就是说,模块A可以通过根state达到修改模块b的state的作用。也提供了根state与模块state,模块state之间互相修改的权限。

### Vue 3 TypeScript Vuex Store Getters Usage and Examples In a Vue 3 project with TypeScript, defining the `Vuex` store's getters involves ensuring type safety while maintaining flexibility. The following example demonstrates how to set up a typed getter within a Vuex store using TypeScript. #### Defining Typed Getters in Vuex Store To ensure that all parts of the state management are strongly typed, one can use interfaces or types for both actions and mutations alongside getters. Here is an illustrative setup: ```typescript // ./src/store/getters.ts import { GetterTree } from 'vuex'; import { StateInterface } from './state'; // Assuming you have defined your state interface elsewhere export const getters: GetterTree<StateInterface, any> = { getExampleData(state): string | null { return state.exampleData || null; } }; ``` The above code snippet defines a simple getter named `getExampleData`, which retrieves data from the application’s state object[^1]. By specifying the return type (`string | null`) explicitly, this ensures compile-time checks on what kind of values will be returned by the getter when accessed at runtime. #### Integrating Getters into Your Vuex Store Module Once the getters are properly typed, integrate them into the main store module like so: ```typescript // ./src/store/index.ts import { createStore, Store } from 'vuex'; import { getters } from './getters'; import { StateInterface } from './state'; const store: Store<StateInterface> = createStore({ state() { return { exampleData: '' }; }, getters, }); export default store; ``` This configuration registers the previously created getter inside the Vuex instance, making it available throughout the entire application whenever needed[^2]. #### Accessing Typed Getters Within Components When accessing these getters within components written in `.vue` files, leverage composition API along with `useStore()` hook provided by official `@vue/composition-api`. This approach allows developers to access stores more conveniently without losing typing benefits offered earlier during development phase. ```javascript <script lang="ts"> import { computed } from 'vue'; import { useStore } from '@/store'; setup () { const store = useStore(); let exampleData = computed(() => store.getters['getExampleData']); return { exampleData }; } </script> ``` By utilizing computed properties combined with direct references through strings pointing towards specific paths under global namespace managed via modules system implemented internally within Vuex framework itself; thus enabling seamless integration between reactive systems present across modern JavaScript frameworks such as Vue.js together with statically-typed languages including TypeScript[^3].
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