vue 防止页面刷新vuex数据丢失

app.vue 

created() {

          if(localStorage.getItem("store")){

            this.$store.replaceState(

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

            );

          }

          //在页面刷新时将vuex里的信息保存到localStorage里

          window.addEventListener("beforeunload",()=>{

            window.localStorage.setItem("store",JSON.stringify(this.$store.state));

          });

        },