Vue3除了keep-alive还有哪些实现页面缓存详解

import { ref, nextTick } from 'vue'

const caches = ref<string[]>([])

export default function useRouteCache () {
  // 添加缓存的路由组件
  function addCache (componentName: string | string []) {
    if (Array.isArray(componentName)) {
      componentName.forEach(addCache)
      return
    }
    
    if (!componentName || caches.value.includes(componentName)) return

    caches.value.push(componentName)
  }

  // 移除缓存的路由组件
  function removeCache (componentName: string) {
    const index = caches.value.indexOf(componentName)
    if (index > -1) {
      return caches.value.splice(index, 1)
    }
  }
  
  // 移除缓存的路由组件的实例
  async function removeCacheEntry (componentName: string) {    
    if (removeCache(componentName)) {
      await nextTick()
      addCache(componentName)
    }
  }
  
  return {
    caches,
    addCache,
    removeCache,
    removeCacheEntry
  }
}

<router-view v-slot="{ Component }">
  <keep-alive :include="caches">
    <component :is="Component" />
  </keep-alive>
</router-view>

<script setup lang="ts">
import useRouteCache from './hooks/useRouteCache'
const { caches, addCache } = useRouteCache()

<!-- 将列表页组件名称添加到需要缓存名单中 -->
addCache(['List'])
</script>

import useRouteCache from '@/hooks/useRouteCache'

const { removeCacheEntry } = useRouteCache()
removeCacheEntry('List')

defineOptions({
  name: 'List1',
  beforeRouteEnter (to: RouteRecordNormalized, from: RouteRecordNormalized) {
    if (from.name === 'Home') {
      const { removeCacheEntry } = useRouteCache()
      removeCacheEntry('List1')
    }
  }
})

// 首页 Home.vue

<li>
  <router-link to="/list" @click="removeCacheBeforeEnter">列表页</router-link>
</li>


<script setup lang="ts">
import useRouteCache from '@/hooks/useRouteCache'

defineOptions({
  name: 'Home'
})

const { removeCacheEntry } = useRouteCache()

// 进入页面前，先清除缓存实例
function removeCacheBeforeEnter () {
  removeCacheEntry('List')
}
</script>

import { defineStore } from 'pinia'

interface Item {
  id?: number,
  content?: string
}

const useListStore = defineStore('list', {
  // 推荐使用 完整类型推断的箭头函数
  state: () => {
    return {
      isRefresh: true,
      pageSize: 30,
      currentPage: 1,
      list: [] as Item[],
      curRow: null as Item | null
    }
  },
  actions: {
    setList (data: Item []) {
      this.list = data
    },
    setCurRow (data: Item) {
      this.curRow = data
    },
    setIsRefresh (data: boolean) {
      this.isRefresh = data
    }
  }
})

export default useListStore

<div>
  <el-page-header @back="goBack">
    <template #content>状态管理实现列表页缓存</template>
  </el-page-header>
  <el-table v-loading="loading" :data="tableData" border style="width: 100%; margin-top: 30px;">
    <el-table-column prop="id" label="id" />
    <el-table-column prop="content" label="内容"/>
    <el-table-column label="操作">
      <template v-slot="{ row }">
        <el-link type="primary" @click="gotoDetail(row)">进入详情</el-link>
        <el-tag type="success" v-if="row.id === listStore.curRow?.id">刚点击</el-tag>
      </template>
    </el-table-column>
  </el-table>
  <el-pagination
    v-model:currentPage="listStore.currentPage"
    :page-size="listStore.pageSize"
    layout="total, prev, pager, next"
    :total="listStore.list.length"
  />
</div>
  
<script setup lang="ts">
import useListStore from '@/store/listStore'
const listStore = useListStore()

...
</script>

defineOptions({
  beforeRouteEnter (to: RouteLocationNormalized, from: RouteLocationNormalized) {
    if (from.name === 'Home') {
      const listStore = useListStore()
      listStore.$reset()
    }
  }
})

onBeforeMount(() => {
  if (!listStore.useCache) {
    loading.value = true
    setTimeout(() => {
      listStore.setList(getData())
      loading.value = false
    }, 1000)
    listStore.useCache = true
  }
})

// PopupPage.vue

<template>
  <div class="popup-page" :class="[!dialogVisible && 'hidden']">
    <slot v-if="dialogVisible"></slot>
  </div>
</template>

<script setup lang="ts">
import { useLockscreen } from 'element-plus'
import { computed, defineProps, defineEmits } from 'vue'
import useHistoryPopup from './useHistoryPopup'

const props = defineProps({
  modelValue: {
    type: Boolean,
    default: false
  },
  // 路由记录
  history: {
    type: Object
  },
  // 配置了history后，初次渲染时，如果有url上有history参数，则自动打开弹窗
  auto: {
    type: Boolean,
    default: true
  },
  size: {
    type: String,
    default: '50%'
  },
  full: {
    type: Boolean,
    default: false
  }
})
const emit = defineEmits(
  ['update:modelValue', 'autoOpen', 'autoClose']
)

const dialogVisible = computed<boolean>({ // 控制弹窗显示
  get () {
    return props.modelValue
  },
  set (val) {
    emit('update:modelValue', val)
  }
})

useLockscreen(dialogVisible)

useHistoryPopup({
  history: computed(() => props.history),
  auto: props.auto,
  dialogVisible: dialogVisible,
  onAutoOpen: () => emit('autoOpen'),
  onAutoClose: () => emit('autoClose')
})
</script>

<style lang='less'>
.popup-page {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  overflow: auto;
  padding: 10px;
  background: #fff;
  
  &.hidden {
    display: none;
  }
}
</style>

<popup-page 
  v-model="visible" 
  full
  :history="{ id: id }">
  <Detail></Detail>
</popup-page>

{
  path: '/list',
  name: 'list',
  component: () => import('./views/List.vue'),
  children: [
    {
      path: '/detail',
      name: 'detail',
      component: () => import('./views/Detail.vue'),
    }
  ]
}

// 列表页
<template>
  <el-table v-loading="loading" :data="tableData" border style="width: 100%; margin-top: 30px;">
    <el-table-column prop="id" label="id" />
    <el-table-column prop="content" label="内容"/>
    <el-table-column label="操作">
      <template v-slot="{ row }">
        <el-link type="primary" @click="gotoDetail(row)">进入详情</el-link>
        <el-tag type="success" v-if="row.id === curRow?.id">刚点击</el-tag>
      </template>
    </el-table-column>
  </el-table>
  <el-pagination
    v-model:currentPage="currentPage"
    :page-size="pageSize"
    layout="total, prev, pager, next"
    :total="list.length"
  />
  
  <!-- 详情页 -->
  <router-view class="popyp-page"></router-view>
</template>

<style lang='less' scoped>
.popyp-page {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #fff;
  overflow: auto;
}
</style>