vue3使用vuex实现页面实时更新数据实例教程(setup)

npm i vuex

import { createApp } from 'vue'
import './style.css'
import App from './App.vue'
//vuex
import store from './store/index.js'
import * as echarts from 'echarts'
const app = createApp(App)
// 全局挂载echarts
createApp(App).config.globalProperties.$echarts = echarts
createApp(App).use(store).mount('#app')

import { createStore } from 'vuex'

const store = createStore({
    state: {
        iotData: {},
        count: 0,
    },
    getters: {

        getStateCount: function (state) {
            console.log('想发火啊');
            return state.iotData;
        }
    },
    mutations: {
        addCount(state, payload) {
            state.count += payload
        },
        setIOTData(state, data) {
            state.iotData = data
            console.log('setIOTData方法', state.iotData);
        },
        updateIOTTagConfig(state, data) {
            //重点，要不然页面数据不更新
            state.iotData=null
            state.iotData = data
            console.log(state.iotData, '进入mutations');
        },
    },
    actions: {
        asyncAddStoreCount(store, payload) { // 第一个参数是vuex固定的参数，不需要手动去传递
            store.commit("addCount", payload)
        },
        asyncupdateIOTTagConfig({ commit, state }, data) {
            commit('updateIOTTagConfig', data)
        },

    },
    modules: {

    }
})

export default store

let timer
import  store  from "../store/index";
export function myStopEcharts() {
    clearTimeout(timer)
}
export function startEcharts() {
 
    timer = setInterval(() => {
        var ydata1 = []
        for (let i = 0; i < 1; i++) {
            ydata1.push({ 'id': Math.round(Math.random() * 20), 'serialNumber': 2001, 'time': 2022 })
        }
        jj(ydata1)
       
    }, 2000)
}
 function jj(ydata1) {
    const messageList = ydata1
    hh(messageList)
}
function hh(messageList) {
    runExit(messageList)

}
function runExit(message) {
    exit(message)
}
 var exitArr = []
function exit(data) {
       exitArr.push(...data)
    if (exitArr.length > 20) {
         exitArr.splice(0,17)
        // console.log(s,exitArr,'pos');
    } 
    store.dispatch('asyncupdateIOTTagConfig',exitArr)
}

<template>
  {{name}} 
  <!-- <h1>vuex中的数据{{ store.state.count }}</h1>
  <button @click="changeStoreCount">改变vuex数据</button>
  <button @click="asyncChangeStoreCount">异步改变vuex数据</button> -->
  <echarts></echarts>
</template>
<script>
import { defineComponent, computed,ref, watch, toRaw ,onUnmounted} from "vue";
import echarts from "./echarts.vue";
import { useStore } from "vuex";
import axios from "axios";
export default defineComponent({
  name: "HelloWorld",
  components:{echarts},
  setup() {
    let {state, commit,getters} = useStore();
    //使用计算属性动态拿到vuex的值
    let name = computed(() => {return state.iotData})
    // let UserInfoNoParams = computed(() => getters['getStateCount'])
    console.log(name,state.iotData,'哎');
    // commit("setIOTData", 1);
    // const nextAge = computed({
    //    get() {
    //     return store.iotData
    //   },
    //   // set(value) {
    //   //   console.log(value)  //  输出新修改的值
    //   //   return age.value = value - 1
    //   // }
    // })
    //监听数据
     watch(name, (newVal, oldVal) => {
      console.log(name,"改变的值", toRaw(newVal));
      console.log("旧",oldVal);
    },{immediate:true,deep: true});
    // console.log(nextAge,'nextAge');
    return {name};
    //   const changeStoreCount = () => {
    //     store.commit("addCount", 1)
    //   }
    //   const asyncChangeStoreCount = () => {
    //     setTimeout(() => {
    //  // asyncAddStoreCount是mutations中的方法，2是传递过去的数据
    //  // 异步改变vuex用dispatch方法，这里用setTimeout模拟异步操作
    //       store.dispatch("asyncAddStoreCount", 2)
    //     }, 1000)
    //   }
    // return { store, changeStoreCount, asyncChangeStoreCount }
  },
});
</script>
<style scoped></style>