diff --git a/src/main.js b/src/main.js
index ef07f389..5ee1a9a1 100644
--- a/src/main.js
+++ b/src/main.js
@@ -14,7 +14,7 @@ import store from './store'
 import router from './router'
 
 import './icons' // icon
-import './permission' // permission control
+import './permission' // 权限控制
 import './utils/error-log' // error log
 
 import * as filters from './filters' // global filters
@@ -24,11 +24,11 @@ import * as filters from './filters' // global filters
  * you want to use MockJs for mock api
  * you can execute: mockXHR()
  *
- * Currently MockJs will be used in the production environment,
+ * Currently MockJs will be used in the production|development environment,
  * please remove it before going online! ! !
  */
 import { mockXHR } from '../mock'
-if (process.env.NODE_ENV === 'production') {
+if (process.env.NODE_ENV === 'development') {
   mockXHR()
 }
 
diff --git a/src/permission.js b/src/permission.js
index 750aeab6..75d03dce 100644
--- a/src/permission.js
+++ b/src/permission.js
@@ -1,7 +1,7 @@
 import router from './router'
 import store from './store'
 import { Message } from 'element-ui'
-import NProgress from 'nprogress' // progress bar
+import NProgress from 'nprogress' // 页面顶部加载进度条
 import 'nprogress/nprogress.css' // progress bar style
 import { getToken } from '@/utils/auth' // get token from cookie
 import getPageTitle from '@/utils/get-page-title'
diff --git a/src/router/index.js b/src/router/index.js
index fbe8ad25..d1818e4d 100644
--- a/src/router/index.js
+++ b/src/router/index.js
@@ -10,7 +10,7 @@ import Layout from '@/layout'
 import componentsRouter from './modules/components'
 import chartsRouter from './modules/charts'
 import tableRouter from './modules/table'
-import nestedRouter from './modules/nested'
+import nestedRouter from './modules/nested' // 嵌套的
 
 /**
  * Note: sub-menu only appear when route children.length >= 1