1.APP.vue

export default ({
  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", "");
      sessionStorage.setItem("store", JSON.stringify(this.$store.state));
    });
  }
})
</script>

2

`npm install vuex-persistedstate --save`    

const store = new Vuex.Store({
  
  plugins: [createPersistedState()] 
})

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Hello World!