登录后调整获取菜单逻辑，不再重复请求getMenu

Author: piexlmax

web/src/permission.js

@@ -38,7 +38,7 @@ router.beforeEach(async(to, from, next) => {
     document.title = getPageTitle(to.meta.title)
     if (whiteList.indexOf(to.name) > -1) {
         if (token) {
-            if (!asyncRouterFlag) {
+            if (!asyncRouterFlag && whiteList.indexOf(from.name) < 0) {
                 asyncRouterFlag++
                 await getRouter()
             }
@@ -50,10 +50,9 @@ router.beforeEach(async(to, from, next) => {
         // 不在白名单中并且已经登陆的时候
         if (token) {
             // 添加flag防止多次获取动态路由和栈溢出
-            if (!asyncRouterFlag) {
+            if (!asyncRouterFlag && whiteList.indexOf(from.name) < 0) {
                 asyncRouterFlag++
                 await getRouter()
-
                 next({...to, replace: true })
             } else {
                 if (to.matched.length) {