为了解决多级路由缓存问题，菜单展开只支持2级 【issues/4091】

src/permission.js

@@ -17,8 +17,8 @@ router.beforeEach((to, from, next) => {
   //解决三级菜单无法缓存问题
   //参考： https://blog.csdn.net/qq_37322135/article/details/126013301
   //参考： https://blog.csdn.net/cwin8951/article/details/106644118
-  if (to.matched && to.matched.length>2) {
-    to.matched.splice(1, to.matched.length - 2)
+  if (to.matched && to.matched.length>3) {
+    to.matched.splice(2, to.matched.length - 3)
   }
   //update-end---author:scott ---date::2022-10-13  for：[jeecg-boot/issues/4091]多级路由缓存问题 #4091--------------