App.vue

<template>
  <div id="app">
    <a-config-provider :locale="locale">
      <router-view />
    </a-config-provider>
  </div>
</template>
<script>
import router from "@/router";
import zhCN from "ant-design-vue/lib/locale-provider/zh_CN";
export default {
  data() {
    return {
      locale: zhCN,
    };
  },
  created() {
    let state = JSON.parse(window.sessionStorage.getItem("state"));
    if (state) {
      this.$store.state.app = state;
    }
  },
  mounted() {
    window.addEventListener("unload", this.saveState);
  },
  methods: {
    saveState() {
      sessionStorage.setItem("state", JSON.stringify(this.$store.state.app));
    },
  },
};
</script>