vue-element-admin项目中实现刷新tab标签不丢失

 mounted() {
    // 页面刷新前缓存和赋值
    this.beforeUnload();
  },
methods:{
	 // 刷新前缓存tab
    beforeUnload() {
      // 监听页面刷新
      window.addEventListener("beforeunload", () => {
        // visitedViews数据结构太复杂无法直接JSON.stringify处理，先转换需要的数据
        let tabViews = this.visitedViews.map(item => {
          return {
            fullPath: item.fullPath,
            hash: item.hash,
            meta: { ...item.meta },
            name: item.name,
            params: { ...item.params },
            path: item.path,
            query: { ...item.query },
            title: item.title
          };
        });
        sessionStorage.setItem("tabViews", JSON.stringify(tabViews));
      });
      // 页面初始化加载判断缓存中是否有数据
      let oldViews = JSON.parse(sessionStorage.getItem("tabViews")) || [];
      if (oldViews.length > 0) {
        this.$store.state.tagsView.visitedViews = oldViews;
      }
    },
}