From c666faed6691bf51918195484f22354ebcf86b8d Mon Sep 17 00:00:00 2001
From: RuoYi <yzz_ivy@163.com>
Date: Sat, 28 Nov 2020 20:31:45 +0800
Subject: [PATCH] 修复三级菜单之间切换页面无法缓存的问题

---
 ruoyi-ui/src/layout/components/AppMain.vue        | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
 ruoyi-ui/src/layout/components/TagsView/index.vue |   5 +++++
 ruoyi-ui/src/layout/components/global.js          |   3 +++
 3 files changed, 120 insertions(+), 9 deletions(-)
 create mode 100644 ruoyi-ui/src/layout/components/global.js

diff --git a/ruoyi-ui/src/layout/components/AppMain.vue b/ruoyi-ui/src/layout/components/AppMain.vue
index 423437b..8da5714 100644
--- a/ruoyi-ui/src/layout/components/AppMain.vue
+++ b/ruoyi-ui/src/layout/components/AppMain.vue
@@ -1,7 +1,8 @@
+<!-- @author ruoyi 20201128 支持三级以上菜单缓存 -->
 <template>
   <section class="app-main">
     <transition name="fade-transform" mode="out-in">
-      <keep-alive :include="cachedViews">
+      <keep-alive :max="20" :exclude="notCacheName">
         <router-view :key="key" />
       </keep-alive>
     </transition>
@@ -9,17 +10,119 @@
 </template>
 
 <script>
+import Global from "@/layout/components/global.js";
+
 export default {
   name: 'AppMain',
   computed: {
-    cachedViews() {
-      return this.$store.state.tagsView.cachedViews
+    notCacheName() {
+      var visitedViews = this.$store.state.tagsView.visitedViews;
+      var noCacheViews = [];
+      Object.keys(visitedViews).some((index) => {
+        if (visitedViews[index].meta.noCache) {
+          noCacheViews.push(visitedViews[index].name);
+        }
+      });
+      return noCacheViews;
     },
     key() {
-      return this.$route.path
-    }
-  }
-}
+      return this.$route.path;
+    },
+  },
+  mounted() {
+    // 关闭标签触发
+    Global.$on("removeCache", (name, view) => {
+      this.removeCache(name, view);
+    });
+  },
+  methods: {
+    // 获取有keep-alive子节点的Vnode
+    getVnode() {
+      // 判断子集非空
+      if (this.$children.length == 0) return false;
+      let vnode;
+      for (let item of this.$children) {
+        // 如果data中有key则代表找到了keep-alive下面的子集，这个key就是router-view上的key
+        if (item.$vnode.data.key) {
+          vnode = item.$vnode;
+          break;
+        }
+      }
+      return vnode ? vnode : false;
+    },
+    // 移除keep-alive缓存
+    removeCache(name, view = {}) {
+      let vnode = this.getVnode();
+      if (!vnode) return false;
+      let componentInstance = vnode.parent.componentInstance;
+      // 这个key是用来获取前缀用来后面正则匹配用的
+      let keyStart = vnode.key.split("/")[0];
+      let thisKey = `${keyStart}${view.fullPath}`;
+      let regKey = `${keyStart}${view.path}`;
+
+      this[name]({ componentInstance, thisKey, regKey });
+    },
+    // 移除其他
+    closeOthersTags({ componentInstance, thisKey }) {
+      Object.keys(componentInstance.cache).forEach((key, index) => {
+        if (key != thisKey) {
+          // 销毁实例(这里存在多个key指向一个缓存的情况可能前面一个已经清除掉了所有要加判断)
+          if (componentInstance.cache[key]) {
+            componentInstance.cache[key].componentInstance.$destroy();
+          }
+          // 删除缓存
+          delete componentInstance.cache[key];
+          // 移除key中对应的key
+          componentInstance.keys.splice(index, 1);
+        }
+      });
+    },
+    // 移除所有缓存
+    closeAllTags({ componentInstance }) {
+      // 销毁实例
+      Object.keys(componentInstance.cache).forEach((key) => {
+        if (componentInstance.cache[key]) {
+          componentInstance.cache[key].componentInstance.$destroy();
+        }
+      });
+      // 删除缓存
+      componentInstance.cache = {};
+      // 移除key中对应的key
+      componentInstance.keys = [];
+    },
+    // 移除单个缓存
+    closeSelectedTag({ componentInstance, regKey }) {
+      let reg = new RegExp(`^${regKey}`);
+      Object.keys(componentInstance.cache).forEach((key, i) => {
+        if (reg.test(key)) {
+          // 销毁实例
+          if (componentInstance.cache[key]) {
+            componentInstance.cache[key].componentInstance.$destroy();
+          }
+          // 删除缓存
+          delete componentInstance.cache[key];
+          // 移除key中对应的key
+          componentInstance.keys.splice(i, 1);
+        }
+      });
+    },
+    // 刷新单个缓存
+    refreshSelectedTag({ componentInstance, thisKey }) {
+      Object.keys(componentInstance.cache).forEach((key, index) => {
+        if (null != thisKey && key.replace("/redirect", "") == thisKey) {
+          // 1 销毁实例(这里存在多个key指向一个缓存的情况可能前面一个已经清除掉了所有要加判断)
+          if (componentInstance.cache[key]) {
+            componentInstance.cache[key].componentInstance.$destroy();
+          }
+          // 2 删除缓存
+          delete componentInstance.cache[key];
+          // 3 移除key中对应的key
+          componentInstance.keys.splice(index, 1);
+        }
+      });
+    },
+  },
+};
 </script>
 
 <style lang="scss" scoped>
@@ -31,7 +134,7 @@ export default {
   overflow: hidden;
 }
 
-.fixed-header+.app-main {
+.fixed-header + .app-main {
   padding-top: 50px;
 }
 
@@ -41,7 +144,7 @@ export default {
     min-height: calc(100vh - 84px);
   }
 
-  .fixed-header+.app-main {
+  .fixed-header + .app-main {
     padding-top: 84px;
   }
 }
diff --git a/ruoyi-ui/src/layout/components/TagsView/index.vue b/ruoyi-ui/src/layout/components/TagsView/index.vue
index dce967c..23eb8f0 100644
--- a/ruoyi-ui/src/layout/components/TagsView/index.vue
+++ b/ruoyi-ui/src/layout/components/TagsView/index.vue
@@ -29,6 +29,7 @@
 <script>
 import ScrollPane from './ScrollPane'
 import path from 'path'
+import Global from "@/layout/components/global.js";
 
 export default {
   components: { ScrollPane },
@@ -144,6 +145,7 @@ export default {
           })
         })
       })
+      Global.$emit("removeCache", "refreshSelectedTag", this.selectedTag);
     },
     closeSelectedTag(view) {
       this.$store.dispatch('tagsView/delView', view).then(({ visitedViews }) => {
@@ -151,12 +153,14 @@ export default {
           this.toLastView(visitedViews, view)
         }
       })
+      Global.$emit("removeCache", "closeSelectedTag", view);
     },
     closeOthersTags() {
       this.$router.push(this.selectedTag)
       this.$store.dispatch('tagsView/delOthersViews', this.selectedTag).then(() => {
         this.moveToCurrentTag()
       })
+      Global.$emit("removeCache", "closeOthersTags", this.selectedTag);
     },
     closeAllTags(view) {
       this.$store.dispatch('tagsView/delAllViews').then(({ visitedViews }) => {
@@ -165,6 +169,7 @@ export default {
         }
         this.toLastView(visitedViews, view)
       })
+      Global.$emit("removeCache", "closeAllTags");
     },
     toLastView(visitedViews, view) {
       const latestView = visitedViews.slice(-1)[0]
diff --git a/ruoyi-ui/src/layout/components/global.js b/ruoyi-ui/src/layout/components/global.js
new file mode 100644
index 0000000..5d2b5b3
--- /dev/null
+++ b/ruoyi-ui/src/layout/components/global.js
@@ -0,0 +1,3 @@
+import Vue from 'vue'
+const global = new Vue()
+export default global
--
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