Vue3中Vuex状态管理学习实战示例详解

demo/
    package.json
    vite.config.js
    index.html
    public/
    src/
        api/
        assets/
        common/
        components/
        store/
            index.js
            modules/
                user.js
                common.js
        views/
            index.vue
        App.vue
        main.js            

// src/store/index.js
import Vuex from 'vuex'
import User from './modules/user'
import Common from './modules/common'
export default new Vuex.Store({
    modules: {
      User,
      Common,
    }
})

// src/store/modules/user.js
import axios from 'axios'
const SET_USER_NAME = 'SET_USER_NAME'
const SET_RANDOM_IMG = 'SET_RANDOM_IMG'
export default {
  namespaced: true,
  state: {
    username: 'Tom',
    randomImg: 'https://images.dog.ceo/breeds/bulldog-french/n02108915_8258.jpg',
  },
  getters: {
    getUsername (state) {
      return state.username
    },
    getRandomImg (state) {
      return state.randomImg
    },
  },
  mutations: {
    [SET_USER_NAME]: (state, username)=>{
      state.username = username
    },
    [SET_RANDOM_IMG]: (state, randomImg)=>{
      state.randomImg = randomImg
    },
  },
  actions: {
    async setUsername ({dispatch, commit, getters}, data) {
      let username = getters.getUsername
      return new Promise((resolve, reject) => {
        setTimeout(()=>{
          commit('GET_USER_NAME', data)
          resolve(data)
        }, 2000)
      })
    },
    async setRandomImg ({dispatch, commit, getters}, data) {
      // let randomImg = getters.getRandomImg
      return new Promise((resolve, reject) => {
        axios.get('https://dog.ceo/api/breeds/image/random').then((res) => {
          let img = res.data.message
          commit('SET_RANDOM_IMG', img)
          resolve(img)
        })
      })
    },
  },
}

// src/main.js
import { createApp } from 'vue'
import router from './router'
import store from './store'
import App from './App.vue'
// ...
const app = createApp(App)
app.use(router).use(store);
app.mount('#app')

// src/views/index.vue
<template>
    <div>
        <van-image
                round
                lazy-load
                width="200"
                height="200"
                :src="img">
            <template #loading>
                <van-loading type="spinner" size="30" />
            </template>
        </van-image>
        <br>
        <van-button type="primary"
                    icon="search"
                    zise="mini"
                    text="随机dog"
                    :loading="loading"
                    @click="getImg"
                    color="linear-gradient(to right, #ff6034, #ee0a24)"
                    loading-text="loading..." />
    </div>
</template>
<script>
    import { ref, computed } from 'vue'
    import { useStore } from 'vuex'
    export default {
        setup () {
            const { state, getters, commit, dispatch } = useStore()
            let img = computed(()=>getters['User/getRandomImg'])
            let loading = ref(false)
            const getImg = async () => {
                loading.value = true
                await dispatch('User/setRandomImg')
                loading.value = false
            }
            return {
                img,
                loading,
                getImg,
            }
        },
    }
</script>