Let's explore whether Uniapp has built-in Vuex

Uniapp is a cross-platform application development framework developed based on the Vue framework. Vuex, as a state management library in Vue, can help Vue applications share and manage state between multiple components. So, does Uniapp have Vuex built-in? Let’s explore it together.

Uniapp has Vuex

The answer is yes. Uniapp has built-in Vuex, allowing developers to use Vuex in Uniapp to help manage the status of the application. This is also one of Uniapp's more complete functions.

Why Vuex is needed

In some more complex applications, there may be multiple components that need to share the same state. If there is no management tool to help us manage state sharing and state changes, then the processing of these state changes will become very troublesome.

The emergence of Vuex is to help us manage state more efficiently. Vuex maintains a global state tree, which allows developers to share state between different components, and can control state modifications through certain rules to ensure state consistency and controllability.

Core concepts of Vuex

When using Vuex, we need to understand several core concepts first:

1. State: state is a global data storage object. Stores all state of the application.
2. Getter: Getter is used to obtain data in state, similar to calculated properties.
3. Mutation: mutation is used to modify the data in the state and can only be executed synchronously.
4. Action: action is used to asynchronously modify the data in the state and can be used to handle asynchronous operations.
5. Module: module is used to divide Vuex into multiple modules, each module has its own state, getter, mutation and action.

How to use Vuex in Uniapp

When using Uniapp to develop a project, we can choose whether to use Vuex when the project is created. If there is no selection, you need to configure it manually.

First, create a store folder under the src folder, and create an index.js file under the folder.

In this file, we need to reference Vuex first:

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

Then, we need to define a Vuex.Store instance:

export default new Vuex.Store({
  state: { // 状态
    userInfo: {}
  },
  mutations: { // 修改状态
    setUserInfo(state, userInfo) {
      state.userInfo = userInfo
    }
  },
  actions: { // 异步修改状态
    fetchUserInfo({ commit }) {
       // 异步请求数据，根据返回值进行状态修改
       let userInfo = {...}
       commit('setUserInfo', userInfo)    
    }
  },
  getters: { // 获取状态
    userInfo(state) {
      return state.userInfo;
    }
  }
})

Finally, introduce it in main.js The store, and inject the store into the Vue instance:

import store from './store'
import App from './App'

Vue.prototype.$store = store;

const app = new Vue({
    ...App,
    store
})
app.$mount()

In this way, in all components, we can use $store to access the state in Vuex. For example, if we want to get userInfo in a certain component, we can write like this:

export default {
  computed: {
    userInfo() {
      return this.$store.getters.userInfo
    }
  }
}

Similarly, if we want to modify userInfo, we can write like this:

this.$store.commit('setUserInfo', userInfo)

If it is an asynchronous modification, We can write like this:

this.$store.dispatch('fetchUserInfo')

Summary

Uniapp has built-in Vuex, allowing developers to manage state more efficiently.

When using Vuex, we need to understand its core concepts: State, Getter, Mutation, Action and Module.

To use Vuex in Uniapp, you need to first create an index.js file in the store folder, define a Vuex.Store instance and introduce the store in main.js.

Finally, in the component, we can access and modify the state in Vuex through $store.

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