refine[permission.js]: switch roles will refresh the sidebar correctly (#1067)

后台菜单->权限测试页->指令权限 切换角色 会正确 刷新侧边栏

> /src/store/modules/permission.js

原方法在递归筛选侧边菜单后， 会意外修改原始 asyncRouterMap 导致侧边菜单重绘不正常
已经用新方法替代修复  结果入下图

![图片](https://s1.ax1x.com/2018/09/07/iCL7f1.gif)

src/store/modules/permission.js

@@ -7,7 +7,7 @@ import { asyncRouterMap, constantRouterMap } from '@/router'
  */
 function hasPermission(roles, route) {
   if (route.meta && route.meta.roles) {
-    return roles.some(role => route.meta.roles.indexOf(role) >= 0)
+    return roles.some(role => route.meta.roles.includes(role))
   } else {
     return true
   }
@@ -15,20 +15,23 @@ function hasPermission(roles, route) {
 
 /**
  * 递归过滤异步路由表，返回符合用户角色权限的路由表
- * @param asyncRouterMap
+ * @param routes asyncRouterMap
  * @param roles
  */
-function filterAsyncRouter(asyncRouterMap, roles) {
-  const accessedRouters = asyncRouterMap.filter(route => {
-    if (hasPermission(roles, route)) {
-      if (route.children && route.children.length) {
-        route.children = filterAsyncRouter(route.children, roles)
+function filterAsyncRouter(routes, roles) {
+  const res = []
+
+  routes.forEach(route => {
+    const tmp = { ...route }
+    if (hasPermission(roles, tmp)) {
+      if (tmp.children) {
+        tmp.children = filterAsyncRouter(tmp.children, roles)
       }
-      return true
+      res.push(tmp)
     }
-    return false
   })
-  return accessedRouters
+
+  return res
 }
 
 const permission = {
@@ -47,7 +50,7 @@ const permission = {
       return new Promise(resolve => {
         const { roles } = data
         let accessedRouters
-        if (roles.indexOf('admin') >= 0) {
+        if (roles.includes('admin')) {
           accessedRouters = asyncRouterMap
         } else {
           accessedRouters = filterAsyncRouter(asyncRouterMap, roles)

src/store/modules/user.js

@@ -122,7 +122,7 @@ const user = {
     },
 
     // 动态修改权限
-    ChangeRoles({ commit }, role) {
+    ChangeRoles({ commit, dispatch }, role) {
       return new Promise(resolve => {
         commit('SET_TOKEN', role)
         setToken(role)
@@ -132,6 +132,7 @@ const user = {
           commit('SET_NAME', data.name)
           commit('SET_AVATAR', data.avatar)
           commit('SET_INTRODUCTION', data.introduction)
+          dispatch('GenerateRoutes', data) // 动态修改权限后 重绘侧边菜单
           resolve()
         })
       })