html login.vue 这是登录需要储存的

this.$httpPostService('/member/user/doLogin', {
	username: that.userName,
	password: that.userPassword,
	code: that.verCode
}).then(res => {
	console.log(res);
	//JSON.stringify是把json对象转化成字符串
	localStorage.setItem("userInfo", JSON.stringify(res)) //只有用本地存储页面刷新的时候才不会被清掉
	this.$store.commit("setPrint", { // 这个使用的是mutations里面方法的调用
		userInfo: res
	})

	this.$router.push("index");
}).catch(err => {
	console.log(err)
})

store.js 建一个store文件夹把js放里面 在main.js 里面引入并全局注册

main.js

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

import { httpPostService, httpGetService } from "./network/axios";
Vue.prototype.$httpPostService = httpPostService;
Vue.prototype.$httpGetService = httpGetService;
import store from './store/store' //这是引入的

import vueTitle from 'vue-wechat-title' // 设置title
Vue.use(vueTitle)

import Mint from 'mint-ui';
Vue.use(Mint);
import 'mint-ui/lib/style.css';
import './assets/less/common.less'
Vue.config.productionTip = false;

/* eslint-disable no-new */
new Vue({
	el: '#app',
	router,
	store,
	components: {
		App
	},
	template: '<App/>'
})

store.js

import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);

const state = {
	userInfo: localStorage.getItem('userInfo') || {} //从缓存里面拿到的数据
};
const getters = {};

const actions = {};

const mutations = {
	setPrint(state, userInfo) {
		state.userInfo = userInfo;
	}

};

export default new Vuex.Store({
	state,
	getters,
	actions,
	mutations
})

全局注册 需要在app.vue里面

<template>
	<div id="app">
		<router-view/>
	</div>
</template>

<script>
	export default {
		name: 'App',
		data() {
			return {

			}
		},
		mounted() {
			//在页面加载时读取localStorage里的状态信息
			localStorage.getItem("userInfo") && this.$store.replaceState(Object.assign(this.$store.state, JSON.parse(localStorage.getItem("userInfo"))));

			//在页面刷新时将vuex里的信息保存到localStorage里
			window.addEventListener("beforeunload", () => {
				localStorage.setItem("userInfo", JSON.stringify(this.$store.state))
			})
		}
	}
</script>

结语

vuex 存的是内存 localStorage是浏览器提供的接口，让你存的是接口，以文件的形式存储到本地这是它们本质的区别 

localStorage 保存对象的时候，需要先将对象转换成json字符串，然后获取的时候在转换成对象形式

链接: https://fly63.com/article/detial/6326