How to use vuex for global component communication in Vue?

Vue is a popular front-end framework that can help us quickly build interactive web applications. In Vue, components are the basic unit for building applications, and each component is responsible for a specific function. However, sometimes we need to communicate between different components, especially when we want to share data globally. That's why Vuex comes into play.

Vuex is a Vue state management model that centrally stores the state of all components and provides a series of APIs for reading and updating these states. In this article, we will introduce how to use Vuex for global component communication.

First, we need to install and configure Vuex. You can use npm or yarn to install Vuex:

npm install vuex

Then import and use Vuex in the project's entry file (usually main.js):

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

Vue.use(Vuex)

// 创建Vuex实例
const store = new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment (state) {
      state.count++
    }
  },
  actions: {
    incrementAsync ({ commit }) {
      setTimeout(() => {
        commit('increment')
      }, 1000)
    }
  },
  getters: {
    getCount: state => state.count
  }
})

new Vue({
  store,
  render: h => h(App)
}).$mount('#app')

In the above example, we create A state named count is defined, and a mutation named increment is defined, as well as an action named incrementAsync and an action named getCount getter.

Next, let’s see how to use Vuex in components.

In the component, we can use the mapState, mapMutations, mapActions and mapGetters methods provided by Vue to simplify Use of Vuex. Let's see an example:

<template>
  <div>
    <div>Count: {{ count }}</div>
    <div>
      <button @click="increment">Increment</button>
      <button @click="incrementAsync">Increment Async</button>
    </div>
  </div>
</template>

<script>
import { mapState, mapMutations, mapActions } from 'vuex'

export default {
  computed: {
    ...mapState(['count'])
  },
  methods: {
    ...mapMutations(['increment']),
    ...mapActions(['incrementAsync'])
  }
}
</script>

In the above example, we have used the mapState method to map the count state into a computed property of the component so that we can Use the count variable directly in the component. We also used the mapMutations and mapActions methods to map the increment and incrementAsync methods to the component's methods.

Now, we have successfully integrated Vuex into our Vue application. We can access and update global state through computed properties and methods in any component.

To summarize, when using Vuex for global component communication, we need to complete the following steps:

1. Install and configure Vuex.
2. Define the state in the Vuex instance, as well as the corresponding mutations, actions, and getters.
3. Use the mapState, mapMutations, mapActions and mapGetters methods in the component to map states and methods into the component .
4. Access and update global state directly in the component.

Using Vuex for global component communication can greatly simplify the code structure of the application and make it easier for us to manage and share data. I hope this article can help you better understand and use Vuex.

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