Vue3 使用vuex 系统常量的两种方法

store/index.js

import { createStore } from 'vuex';
import index from './modules/index';
 
const store = createStore({
  modules: {
    index
  }
});
 
export default store;

store/modules/index.js

const state = {
    dataObj: '123'
};
const mutations = {
  saveDataObj(state, obj) {
    state.dataObj = obj;
  }
}; 
export default {
  state,
  mutations
};

1 第一种

<template>
	<section class="module">
		<span class="title">招标项目推荐</span>

	</section>
</template>

<script>
	
	import {	ref, onMounted, 	computed 	} from 'vue';
	import {	useStore } from 'vuex';
	export default {
		setup() {
			const store = useStore();
			
			const dataObj= computed(() => {
				 return store.state.index.dataObj;	 
			});
			// 点击按钮 更改从store获取的数据
			// const saveData = () => {
			// 	console.log("1111")
			// 	store.commit('saveDataObj', '2222');
			// };
         return {
				saveData 
				dataObj
			};
		}
	};
</script>

2 第二种

<script>
	
	import {useStore} from 'vuex';
	
	export default {
		data() {
			return {
				dataObj:'',
			};
		},
		computed:{
			key(){
				this.dataObj= this.$store.state.index.dataObj;
			}
			
		},

		methods: {
			handleLogin(type) {
			 			console.log("dataObj",this.dataObj)			
			},	
		}
	};
</script>