vue3.2中的vuex使用详解

npm install vuex --save

import { createStore } from 'vuex'
 
export default createStore({
  state: {
  },
  getters: {
  },
  mutations: {
  },
  actions: {
  },
  modules: {
  }
})

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
 
createApp(App).use(store).use(router).mount('#app')

import { createStore } from 'vuex'
let n =parseInt(localStorage.getItem('keyvalue')) 
export default createStore({
  state: {
    num: n?n: 0
  },
  getters: {
  },
  mutations: {
    setNum(state,nums){
      // 累加++
      state.num += nums
    }
  },
  actions: {
    setNums(state,nums){
      // 累加++
      state.commit('setNum',nums)
    }
  },
  modules: {
  }
})

<template>
  <!-- 改变Vuex的值setNum -->
  <button @click="setNum">改变Vuex的值setNum</button>
  <p>{{ store.state.num }}</p>
</template>
 
  <script setup>
import { useRouter } from "vue-router";
import { useStore } from "vuex";
const useRouters = useRouter();
// 引入useStore 方法
const store = useStore(); // 该方法用于返回store 实例
const setNum = () => {
  store.dispatch("setNums", 1);
  localStorage.setItem("keyvalue", store.state.num);
};
</script>

export default {
    save(key,value){
        localStorage.setItem(key,value)
    },
    remove(key){
        localStorage.removeItem(key)
    },
    get(key){
        return localStorage.getItem(key)
    }
}

//这个名字随便命名，尽量语义化一点
import storage from '@/tools/storage.js'
//存到vueX中
store.commit("saveToken",res.data.data.token);
// 将token存储到本地，方便取值 第一个参数是--名字 第二个是---存储的对象，数组或，变量
 storage.save("token",res.data.data.token)

import { createStore } from 'vuex'
// 引入
import storage from '@/tools/storage.js'
// 取值
let token = storage.get("token");
export default createStore({
  state: {
// 防止刷新之后，丢失
    token:token?token:"",
  },
  getters: {
  },
  mutations: {
    // 将token存储到vuex中
    saveToken(state,token){
      state.token = token
    },
  },
  actions: {
  },
  modules: {
  }
})

import { createStore } from 'vuex'
export default createStore({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++;
    },
    decrement(state) {
      state.count--;
    }
  },
  actions: {
    incrementAsync({ commit }) {
      setTimeout(() => {
        commit('increment');
      }, 1000);
    }
  },
  getters: {
    squaredCount(state) {
      return state.count * state.count;
    }
  }
})

<template>
  <!-- 改变Vuex的值setNum -->
  <button @click="setNum">改变Vuex的值setNum</button>
  <div>
    <p>Count: {{ count }}</p>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementAsync">+ (async)</button>
    <p>Squared count: {{ squaredCount }}</p>
  </div>
</template>
 
  <script  setup>
// import { useRouter } from "vue-router";
import { mapState, mapMutations, mapActions, mapGetters } from "vuex";
import { useStore } from "vuex";
import { computed } from "vue";
const store = useStore();
 
const count = computed(() => store.state.count);
 
const squaredCount = computed(() => store.getters.squaredCount);
 
const increment = () => {
  store.commit("increment");
};
 
const decrement = () => {
  store.commit("decrement");
};
 
const incrementAsync = () => {
  store.dispatch("incrementAsync");
};
 
// import { useStore } from "vuex";
// const useRouters = useRouter();
// // 引入useStore 方法
// const store = useStore(); // 该方法用于返回store 实例
 
// const setNum = () => {
 
// };
 
</script>