perf keep-alive in nested route

* 1.删除无用的属性
2.修改readme
3.修改eval.js，给后两个参数设置默认值

* update readme

src/components/TreeTable/eval.js

@@ -4,7 +4,7 @@
 */
 'use strict'
 import Vue from 'vue'
-export default function treeToArray(data, expandedAll, parent, level) {
+export default function treeToArray(data, expandedAll, parent = null, level = null) {
   let tmp = []
   Array.from(data).forEach(function(record) {
     if (record._expanded === undefined) {

src/components/TreeTable/index.vue

@@ -33,7 +33,6 @@ import treeToArray from './eval'
 export default {
   name: 'treeTable',
   props: {
-    a: 1,
     data: {
       type: [Array, Object],
       required: true

src/components/TreeTable/readme.md

@@ -1,8 +1,8 @@
 ## 写在前面
-此组件仅提供一个创建TreeTable的解决方案
+此组件仅提供一个创建TreeTable的解决思路
 
 ## prop说明
-### data
+#### *data*
   **必填**
 
   原始数据,要求是一个数组或者对象
@@ -35,13 +35,16 @@
     }
   ```
 
-### columns
+#### columns
   列属性,要求是一个数组
 
-  1. text: 显示在表头
-  2. value: 对应data的key，treeTable将显示相应的value
-  3. width: 每列的宽度，为一个数字
+  1. text: 显示在表头的文字
+  2. value: 对应data的key。treeTable将显示相应的value
+  3. width: 每列的宽度，为一个数字(可选)
+  
   如果你想要每个字段都有自定义的样式或者嵌套其他组件，columns可不提供，直接像在el-table一样写即可，如果没有自定义内容，提供columns将更加的便捷方便
+  
+  如果你有几个字段是需要自定义的，几个不需要，那么可以将不需要自定义的字段放入columns，将需要自定义的内容放入到slot中，详情见后文
   ```javascript
   [{
     value:string,
@@ -54,25 +57,33 @@
   }]
   ```
 
-### expandAll
+#### expandAll
   是否默认全部展开，boolean值，默认为false
 
-### evalFunc
+#### evalFunc
   解析函数，function，非必须
 
-  如果不提供，将使用默认的evalFunc
+  如果不提供，将使用默认的[evalFunc](./eval.js)
 
-  如果提供了evalFunc,那么会用提供的evalFunc去解析data，并返回treeTable渲染所需要的值。如何编写一个evalFunc，请参考此目录下的*eval.js*
+  如果提供了evalFunc,那么会用提供的evalFunc去解析data，并返回treeTable渲染所需要的值。如何编写一个evalFunc，请参考[*eval.js*](https://github.com/PanJiaChen/vue-element-admin/blob/master/src/components/TreeTable/eval.js)或[*customEval.js*](https://github.com/PanJiaChen/vue-element-admin/blob/master/src/views/example/table/treeTable/customEval.js)
 
-### evalArgs
+#### evalArgs
   解析函数的参数，是一个数组
 
-  **请注意，自定义的解析函数参数第一个为this.data，你不需要在evalArgs填写。**
+  **请注意，自定义的解析函数参数第一个为this.data，你不需要在evalArgs填写。** *this.data为需要解析的数据*
 
   如你的解析函数需要的参数为`(this.data,1,2,3,4)`，那么你只需要将`[1,2,3,4]`赋值给`evalArgs`就可以了
   
+  如果你的解析函数参数只有一个`(this.data)`,那么就可以不用填写evalArgs了
+  
+  具体可参考[*customEval.js*](https://github.com/PanJiaChen/vue-element-admin/blob/master/src/views/example/table/treeTable/customEval.js)的函数参数和[customTreeTable](https://github.com/PanJiaChen/vue-element-admin/blob/master/src/views/example/table/treeTable/customTreeTable.vue)的`evalArgs`属性值
+
  ## slot
- 请参考`customTreeTable`
+ 这是一个自定义列的插槽。
+ 
+ 默认情况下，treeTable只有一行行展示数据的功能。但是一般情况下，我们会要给行加上一个操作按钮或者根据当行数据展示不同的样式，这时我们就需要自定义列了。请参考[customTreeTable](https://github.com/PanJiaChen/vue-element-admin/blob/master/src/views/example/table/treeTable/customTreeTable.vue)，[实例效果](http://panjiachen.github.io/vue-element-admin/#/example/table/custom-tree-table)
+ 
+ `slot`和`columns属性`可同时存在,columns里面的数据列会在slot自定义列的左边展示
 
  ## 其他
   如果有其他的需求，请参考[el-table](http://element-cn.eleme.io/#/en-US/component/table)的api自行修改index.vue

src/lang/en.js

@@ -42,7 +42,8 @@ export default {
     exportExcel: 'Export Excel',
     selectExcel: 'Export Selected',
     uploadExcel: 'Upload Excel',
-    exportZip: 'Zip',
+    zip: 'Zip',
+    exportZip: 'Export Zip',
     theme: 'Theme',
     clipboardDemo: 'Clipboard',
     i18n: 'I18n'

src/lang/zh.js

@@ -24,10 +24,10 @@ export default {
     mixChart: '混合图表',
     example: '综合实例',
     Table: 'Table',
-    dynamicTable: '动态table',
-    dragTable: '拖拽table',
-    inlineEditTable: 'table内编辑',
-    complexTable: '综合table',
+    dynamicTable: '动态Table',
+    dragTable: '拖拽Table',
+    inlineEditTable: 'Table内编辑',
+    complexTable: '综合Table',
     treeTable: '树形表格',
     customTreeTable: '自定义树表',
     tab: 'Tab',
@@ -38,13 +38,14 @@ export default {
     page401: '401',
     page404: '404',
     errorLog: '错误日志',
-    excel: 'excel',
-    exportExcel: 'export excel',
-    selectExcel: 'export selected',
-    uploadExcel: 'upload excel',
-    exportZip: 'zip',
+    excel: 'Excel',
+    exportExcel: 'Export Excel',
+    selectExcel: 'Export Selected',
+    uploadExcel: 'Upload Excel',
+    zip: 'Zip',
+    exportZip: 'Export Zip',
     theme: '换肤',
-    clipboardDemo: 'clipboard',
+    clipboardDemo: 'Clipboard',
     i18n: '国际化'
   },
   navbar: {

src/router/index.js

@@ -15,6 +15,9 @@ import Layout from '../views/layout/Layout'
 
 /**
 * hidden: true                   if `hidden:true` will not show in the sidebar(default is false)
+* alwaysShow: true               if set true, will always show the root menu, whatever its child routes length
+*                                if not set alwaysShow, only more than one route under the children
+*                                it will becomes nested mode, otherwise not show the root menu
 * redirect: noredirect           if `redirect:noredirect` will no redirct in the breadcrumb
 * name:'router-name'             the name is used by <keep-alive> (must set!!!)
 * meta : {
@@ -217,7 +220,9 @@ export const asyncRouterMap = [
     path: '/zip',
     component: Layout,
     redirect: '/zip/download',
-    children: [{ path: 'download', component: _import('zip/index'), name: 'exportZip', meta: { title: 'exportZip', icon: 'zip' }}]
+    alwaysShow: true,
+    meta: { title: 'zip', icon: 'zip' },
+    children: [{ path: 'download', component: _import('zip/index'), name: 'exportZip', meta: { title: 'exportZip' }}]
   },
 
   {

src/store/modules/tagsView.js

@@ -6,14 +6,21 @@ const tagsView = {
   mutations: {
     ADD_VISITED_VIEWS: (state, view) => {
       if (state.visitedViews.some(v => v.path === view.path)) return
+
+      if (view.showInVisitedViews) {
         state.visitedViews.push({
           name: view.name,
           path: view.path,
           title: view.meta.title || 'no-name'
         })
-      if (!view.meta.noCache) {
-        state.cachedViews.push(view.name)
       }
+
+      if (!view.meta.noCache) {
+        const cachedViews = [...state.cachedViews]
+        cachedViews.push(view.name)
+        state.cachedViews = Array.from(new Set([...cachedViews]))
+      }
+      console.log(state.cachedViews)
     },
     DEL_VISITED_VIEWS: (state, view) => {
       for (const [i, v] of state.visitedViews.entries()) {

src/views/example/table/index.vue

@@ -8,7 +8,7 @@
 
 <script>
 export default {
-  name: 'TableMain',
+  name: 'Table',
   computed: {
     cachedViews() {
       return this.$store.state.tagsView.cachedViews

src/views/layout/components/Sidebar/SidebarItem.vue

@@ -2,7 +2,7 @@
   <div class="menu-wrapper">
     <template v-for="item in routes" v-if="!item.hidden&&item.children">
 
-      <router-link v-if="item.children.length===1 && !item.children[0].children" :to="item.path+'/'+item.children[0].path" :key="item.children[0].name">
+      <router-link v-if="item.children.length===1 && !item.children[0].children&&!item.alwaysShow" :to="item.path+'/'+item.children[0].path" :key="item.children[0].name">
         <el-menu-item :index="item.path+'/'+item.children[0].path" :class="{'submenu-title-noDropdown':!isNest}">
           <svg-icon v-if="item.children[0].meta&&item.children[0].meta.icon" :icon-class="item.children[0].meta.icon"></svg-icon>
           <span v-if="item.children[0].meta&&item.children[0].meta.title">{{generateTitle(item.children[0].meta.title)}}</span>

src/views/layout/components/TagsView.vue

@@ -52,8 +52,11 @@ export default {
   methods: {
     generateTitle, // generateTitle by vue-i18n
     generateRoute() {
-      if (this.$route.name) {
-        return this.$route
+      let matched = [...this.$route.matched]
+      matched.splice(0, 1)
+      matched = matched.filter(item => item.name)
+      if (matched) {
+        return matched
       }
       return false
     },
@@ -61,11 +64,17 @@ export default {
       return route.path === this.$route.path || route.name === this.$route.name
     },
     addViewTags() {
-      const route = this.generateRoute()
-      if (!route) {
+      const routes = this.generateRoute()
+      if (!routes) {
         return false
       }
-      this.$store.dispatch('addVisitedViews', route)
+      const length = routes.length
+      routes.forEach((item, index) => {
+        if (index === length - 1) {
+          item.showInVisitedViews = true
+        }
+        this.$store.dispatch('addVisitedViews', item)
+      })
     },
     moveToCurrentTag() {
       const tags = this.$refs.tag