js 如何使用vuex

以下是使用Vuex的步骤和示例代码：

1.安装Vuex

npm install vuex --save

2.创建store.js文件

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

Vue.use(Vuex)

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

export default store

3.在main.js中引入store.js

import Vue from 'vue'
import App from './App.vue'
import store from './store'

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

4.在组件中使用Vuex

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

<script>
import { mapGetters, mapActions } from 'vuex'

export default {
  computed: {
    ...mapGetters([
      'getCount'
    ]),
    count () {
      return this.getCount
    }
  },
  methods: {
    ...mapActions([
      'incrementAsync'
    ]),
    increment () {
      this.$store.commit('increment')
    }
  }
}
</script>