refactor router

src/router/_import_development.js

@@ -1 +0,0 @@
-module.exports = file => require('@/views/' + file + '.vue').default // vue-loader at least v13.0.0+

src/router/_import_production.js

@@ -1 +0,0 @@
-module.exports = file => () => import('@/views/' + file + '.vue')

src/router/index.js

@@ -1,6 +1,6 @@
 import Vue from 'vue'
 import Router from 'vue-router'
-const _import = require('./_import_' + process.env.NODE_ENV)
+
 // in development-env not use lazy-loading, because lazy-loading too many pages will cause webpack hot update too slow. so only in production use lazy-loading;
 // detail: https://panjiachen.github.io/vue-element-admin-site/#/lazy-loading
 
@@ -19,8 +19,8 @@ import Layout from '../views/layout/Layout'
   }
 **/
 export const constantRouterMap = [
-  { path: '/login', component: _import('login/index'), hidden: true },
-  { path: '/404', component: _import('404'), hidden: true },
+  { path: '/login', component: () => import('@/views/login/index'), hidden: true },
+  { path: '/404', component: () => import('@/views/404'), hidden: true },
 
   {
     path: '/',
@@ -30,7 +30,7 @@ export const constantRouterMap = [
     hidden: true,
     children: [{
       path: 'dashboard',
-      component: _import('dashboard/index')
+      component: () => import('@/views/dashboard/index')
     }]
   },
 
@@ -44,13 +44,13 @@ export const constantRouterMap = [
       {
         path: 'table',
         name: 'Table',
-        component: _import('table/index'),
+        component: () => import('@/views/table/index'),
         meta: { title: 'Table', icon: 'table' }
       },
       {
         path: 'tree',
         name: 'Tree',
-        component: _import('tree/index'),
+        component: () => import('@/views/tree/index'),
         meta: { title: 'Tree', icon: 'tree' }
       }
     ]
@@ -63,7 +63,7 @@ export const constantRouterMap = [
       {
         path: 'index',
         name: 'Form',
-        component: _import('form/index'),
+        component: () => import('@/views/form/index'),
         meta: { title: 'Form', icon: 'form' }
       }
     ]