解决vue页面刷新，数据丢失的问题

import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

export default new Vuex.Store（{
 state: {
  orderList: [],
  menuList: []
 },
 mutations: {
  orderList(s, d) {
   s.orderList= d;
   window.localStorage.setItem("list",JSON.stringify(s.orderList))
  }, 
  menuList(s, d) {
   s.menuList = d;
   window.localStorage.setItem("list",JSON.stringify(s.menuList))
  },
 }
}）

if (window.localStorage.getItem("list") ) {
  this.$store.replaceState(Object.assign({}, 
  this.$store.state,JSON.parse(window.localStorage.getItem("list"))))
} 

if (window.localStorage.getItem("list") ) {
  this.$store.replaceState(Object.assign({}, this.$store.state,JSON.parse(window.localStorage.getItem("list"))))
 } 

window.addEventListener("beforeunload",()=>{
  window.localStorage.setItem("list",JSON.stringify(this.$store.state))
 })

computed:{
  orderList() {
    return this.$store.state.orderList
  }
}