Vuex-Persist is a library for implementing persistent state in Vuex. It can be used to solve the problem that the application loses the state in the Vuex store after refreshing the browser or closing the page.
Specifically, Vuex-Persist can be used to:
1. Save the state of the Vuex store in the browser's local storage (localStorage), so that the state can be automatically restored after the page is refreshed or reloaded.
2. Save the state of the Vuex store in session storage (sessionStorage) so that the state is preserved during the same session.
3. Save the state of the Vuex store to a cookie so that the state can be preserved in the same browser.
4. Save the state of the Vuex store to IndexedDB to preserve the state in the same browser.
By using Vuex-Persist, you can ensure that the state in the Vuex store is not lost when the page is refreshed or the application is reloaded. This can help you improve the user experience, allowing users to maintain their customizations and preferences while using your application.
How to use it:
1. Install Vuex-Persist
Vuex-Persist can be installed using npm or yarn:
`npm install vuex-persist
`或者
`yarn add vuex-persist`
2. Import Vuex-Persist in Vuex store
You need to import Vuex-Persist in the Vuex store, then create a new Vuex-Persist plugin and add it to Vuex's plugin list. Here is a sample code: ```
import Vuex from 'vuex';
import VuexPersist from 'vuex-persist';
const vuexLocalStorage = new VuexPersist({
key: 'my-app',
storage: window.localStorage,
});
const store = new Vuex.Store({
// ...your store options
plugins: [vuexLocalStorage.plugin],
});```
In the code above, we first imported Vuex and Vuex-Persist. We then created a new Vuex-Persist plugin and added it to Vuex's list of plugins. When creating a plugin, we can specify the name of the storage key ('my-app') and the storage engine to use (localStorage in this case).
3. Enable auto-reload
If you want to automatically restore the state of the Vuex store when you refresh the page or reload the application, you need to enable auto-reload. To do this, you need to set the autoRehydrate property to true when creating the plugin:
```
const vuexLocalStorage = new VuexPersist({
key: 'my-app',
storage: window.localStorage,
autoRehydrate: true,
});```
4. Specify the state to persist
By default, Vuex-Persist will persist the state of the entire Vuex store. If you only want to save the state of certain modules, you can specify the name of the module when creating the plugin:
```
const vuexLocalStorage = new VuexPersist({
key: 'my-app',
storage: window.localStorage,
autoRehydrate: true,
});
```
In the code above, we only saved the state of the modules named "auth" and "cart".
That's the basic steps to implement persistent state in a Vue application using Vuex-Persist. Using this library, you can easily save application state to local storage, session storage, cookies or IndexedDB and automatically restore that state on application reload.