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<>1.问题描述
一般在登录成功的时候需要把用户信息，菜单信息放置vuex中，作为全局的共享数据。但是在页面刷新的时候vuex里的数据会重新初始化，导致数据丢失。因为vuex里的数据是保存在运行内存中的，当页面刷新时，页面会重新加载vue实例，vuex里面的数据就会被清空。
我在一个组件（例如登录组件页面）中登录了后，其它页面要怎么获取和响应这个变化，使用通过计算属性实现响应数据的变化，mapGetters获取vuex
computed: { ...mapGetters(['blogUser']) },
但是刷新页面后数据丢失了！！
<>2.解决思路：
办法一：将vuex中的数据直接保存到浏览器缓存中（sessionStorage、localStorage、cookie）
办法二：在页面刷新的时候再次请求远程数据，使之动态更新vuex数据
办法三：在父页面向后台请求远程数据，并且在页面刷新前将vuex的数据先保存至sessionStorage（以防请求数据量过大页面加载时拿不到返回的数据）
因为我存取的数据比较少所以通过办法一解决：
在App.vue中添加以下代码
//===========================下面是解决刷新页面丢失vuex数据 created() {
//在页面加载时读取sessionStorage里的状态信息 if (sessionStorage.getItem('store')) {
this.$store.replaceState(Object.assign({}, this.$store.state,
JSON.parse(sessionStorage.getItem('store')))); }
//在页面刷新时将vuex里的信息保存到sessionStorage里 window.addEventListener('beforeunload', ()
=> { sessionStorage.setItem('store', JSON.stringify(this.$store.state)); }); }
