5.标签导航支持对应路由缓存

效果图
默认情况下没有 noCache属性 或为false 都会进行缓存 true不缓存



再切回来input内容还在

如果为true



再切回来 input内容没有了

右键删除某一个标签导航时也要删除对应路由缓存
效果

关闭后再打开 input内容被清空

5-1 修改store创建缓存列表

再添加标签导航时，同时也判断该路由要不要缓存，要缓存就根据路由配置的name属性进行缓存（路由组件的name要与路由配置的name一致）再添加到keep-alive inludes的缓存列表中。 （keep-alive内部是根据组件的name进行缓存，我们添加到cachedViews缓存列表的name是从每条路由配置的name取得值，所以路由组件和路由配置中必须要有一致的name属性。）

tagsView module

主要就是添加cachedViews缓存集合，再新增用来添加和删除cachedViews缓存列表actions和muations

state


actions （添加、删除）

mutations

src/store/modules/tagsView.ts

import { Module, ActionTree, MutationTree } from 'vuex'
import { RouteRecordRaw, RouteRecordNormalized, RouteRecordName } from 'vue-router'
import { IRootState } from '@/store'
// 携带fullPath
export interface RouteLocationWithFullPath extends RouteRecordNormalized {
  fullPath?: string;
}
export interface ITagsViewState {
  // 存放当前显示的tags view集合
  visitedViews: RouteLocationWithFullPath[];
  // 根据路由name缓存集合
  cachedViews: RouteRecordName[];
}
// 定义mutations
const mutations: MutationTree<ITagsViewState> = {
  // 添加可显示tags view
  ADD_VISITED_VIEW(state, view) {
    // 过滤去重
    if (state.visitedViews.some(v => v.path === view.path)) return
    // 没有titles时处理
    state.visitedViews.push(Object.assign({}, view, {
      title: view.meta.title || 'tag-name'
    }))
  },
  // 如果路由meta.noCache没有 默认或为false代表进行缓存，为true不缓存
  // 默认缓存所有路由
  ADD_CACHED_VIEW(state, view) {
    // 只有路由有name才可缓存集合keep-alive inludes使用
    if (state.cachedViews.includes(view.name)) return
    if (!view.meta.noCache) {
      state.cachedViews.push(view.name)
    }
  },
  // 可删除指定的一个view
  DEL_VISITED_VIEW(state, view) {
    const i = state.visitedViews.indexOf(view)
    if (i > -1) {
      state.visitedViews.splice(i, 1)
    }
  },
  // 可删除指定的一个view缓存
  DEL_CACHED_VIEW(state, view) {
    const index = state.cachedViews.indexOf(view.name)
    index > -1 && state.cachedViews.splice(index, 1)
  },
  // 清空缓存列表
  DEL_ALL_CACHED_VIEWS(state) {
    state.cachedViews = []
  }
}
// 定义actions
const actions: ActionTree<ITagsViewState, IRootState> = {
  // 添加tags view
  addView({ dispatch }, view: RouteRecordRaw) {
    // 添加tag时也要判断该tag是否需要缓存
    dispatch('addVisitedView', view)
    dispatch('addCachedView', view)
  },
  // 添加可显示的tags view 添加前commit里需要进行去重过滤
  addVisitedView({ commit }, view: RouteRecordRaw) {
    commit('ADD_VISITED_VIEW', view)
  },
  // 添加可缓存的标签tag
  addCachedView({ commit }, view: RouteRecordRaw) {
    commit('ADD_CACHED_VIEW', view)
  },
  // 删除指定tags view 同时要把它从visitedViews和cachedViews中删除
  delView({ dispatch }, view: RouteRecordRaw) {
    return new Promise(resolve => {
      // 删除对应显示的路由tag
      dispatch('delVisitedView', view)
      // 删除对应缓存的路由
      dispatch('delCachedView', view)
      resolve(null)
    })
  },
  // 从可显示的集合中 删除tags view
  delVisitedView({ commit }, view: RouteRecordRaw) {
    commit('DEL_VISITED_VIEW', view)
  },
  // 从缓存列表删除指定tag view
  delCachedView({ commit }, view: RouteRecordRaw) {
    return new Promise(resolve => {
      commit('DEL_CACHED_VIEW', view)
      resolve(null)
    })
  },
  // 清空缓存列表
  delAllCachedViews({ commit }) {
    commit('DEL_ALL_CACHED_VIEWS')
  }
}
const tagsView: Module<ITagsViewState, IRootState> = {
  namespaced: true,
  state: {
    visitedViews: [],
    cachedViews: []
  },
  mutations,
  actions
}
export default tagsView

5-2 AppMain中根据store中cachedViews列表进行缓存

之前我们是在AppMian中给了keep-alive的includes空数组，现在换成从store中获取cachedViews缓存列表

src/layout/components/AppMain.vue

<template>
  <div class="app-main">
    <!-- vue3 路由缓存 https://next.router.vuejs.org/guide/migration/index.html#router-view-keep-alive-and-transition -->
    <router-view v-slot={Component}>
      <transition name="fade-transform" mode="out-in">
        <keep-alive :include="cachedViews">
          <component :is="Component" :key="key" />
        </keep-alive>
      </transition>
    </router-view>
  </div>
</template>
<script lang="ts">
import { computed, defineComponent } from 'vue'
import { useRoute } from 'vue-router'
import { useStore } from '@/store'
export default defineComponent({
  name: 'AppMain',
  setup() {
    const route = useRoute()
    const store = useStore()
    const key = computed(() => route.path)
    // 缓存路由集合 暂时先是空数组
    const cachedViews = computed(() => store.state.tagsView.cachedViews)
    return {
      key,
      cachedViews
    }
  }
})
</script>
<style lang="scss" scoped>
.app-main {
  /* navbar 50px  */
  min-height: calc(100vh - 50px);
}
.fade-transform-enter-active,
.fade-transform-leave-active {
  transition: all .5s;
}
.fade-transform-enter-from {
  opacity: 0;
  transform: translateX(-30px);
}
.fade-transform-leave-to {
  opacity: 0;
  transform: translateX(30px);
}
</style>

5-3 修改SizeSelect组件

SizeSelect组件主要用来切换element组件size，由于路由默认会被缓存，会导致动态修改了elemnt组件size不更新，所以需要在修改size后 清空缓存里列表 在刷新当前路由

<template>
  <div>
    <el-dropdown trigger="click" @command="handleSize">
      <div>
        <svg-icon class-name="size-icon" icon-class="size"></svg-icon>
      </div>
      <template #dropdown>
        <el-dropdown-menu>
          <el-dropdown-item
            v-for="item in sizeOptions"
            :key="item.value"
            :command="item.value"
            :disabled="item.value === size"
          >
            {{ item.label }}
          </el-dropdown-item>
        </el-dropdown-menu>
      </template>
    </el-dropdown>
  </div>
</template>
<script lang="ts">
import { Size } from '@/plugins/element'
import {
  defineComponent,
  ref,
  getCurrentInstance,
  ComponentInternalInstance,
  ComponentPublicInstance,
  computed
} from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { useStore } from '@/store'
import { nextTick } from 'process'
export default defineComponent({
  name: 'SizeSelect',
  setup() {
    const store = useStore()
    const route = useRoute()
    const router = useRouter()
    const { proxy } = getCurrentInstance() as ComponentInternalInstance
    // store中获取size
    const size = computed(() => store.getters.size)
    // element size 选项
    const sizeOptions = ref([
      { label: 'Default', value: 'default' },
      { label: 'Medium', value: 'medium' },
      { label: 'Small', value: 'small' },
      { label: 'Mini', value: 'mini' }
    ])
    // 刷新当前路由
    const refreshView = () => {
      // 需要清除路由缓存 否则size配置改变后组件size状态被缓存不更新
      store.dispatch('tagsView/delAllCachedViews')
      const { fullPath } = route
      nextTick(() => {
        // 跳转到重定向中间页 实现当前路由刷新
        router.replace({
          path: '/redirect' + fullPath
        })
      })
    }
    // command 获取点击按钮的command属性值 作为size值
    const handleSize = (command: Size) => {
      // 修改element-plus组件尺寸
      (proxy as ComponentPublicInstance).$ELEMENT.size = command
      // 更新store
      store.dispatch('app/setSize', command)
      // 切换size需要刷新路由才能生效
      refreshView()
      proxy?.$message.success({
        type: 'success',
        message: 'Switch Size Success'
      })
    }
    return {
      sizeOptions,
      size,
      handleSize
    }
  }
})
</script>
<style lang="scss">
  .size-icon {
    font-size: 18px;
  }
</style>

5-3 测试

通过修改路由 noCache属性来测试

本节参考源码

https://gitee.com/brolly/vue3-element-admin/commit/cb38b128c2a0b193d4ca42083b11e1c1b1c97870