[vuex]持久化存储

App.vue    //cache缓存永久缓存的变量

<script>
export default {
    name: "App",
    created() {
        this.persisted();
    },
    methods: {//持久化
        persisted() {
            if (sessionStorage.getItem("cache")) {
                this.$store.replaceState(
                    Object.assign(
                        {},
                        this.$store.state,
                        JSON.parse(sessionStorage.getItem("cache"))
                    )
                );
                sessionStorage.removeItem("cache");
            }
            //监听刷新
            addEventListener("beforeunload", () => {
                sessionStorage.setItem(
                    "cache",
                    JSON.stringify(this.$store.state.cache)
                );
            });
        },
    },
};
</script>
<style>
</style>