Vue 通过vuex动态缓存 keep-alive-526互联

在需要组件缓存的页面路由添加keep-alive属性为true

 [{
        path: 'text',
        component: () =>
            import('@/views/text/index'),
        name: 'text',
        meta: { title: 'text', needRole: true, keepAlive: true }
    },

在app.vue中加入keep-alive 标签 <script>标签中导入vuex

<template>
  <div id="app">
    <keep-alive :include="cachedViews" :max="10">
      <router-view />
    </keep-alive>
  </div>
</template>

import store from '@/store'
import { mapGetters } from 'vuex'
export default {
  name: 'App',
  computed: {
    ...mapGetters(['cachedViews'])
  },
  watch: {
    $route: {
      handler(newVal) {
        const {
          name,
          meta: { keepAlive }
        } = newVal
        if (name && keepAlive) {
          store.dispatch('tagsView/addCachedView', newVal)
        }
      },
      immediate: true
    }
  }
}

Vuex store/moudle/tagView.js 缓存组件(增加，删除，更新)

const state = {
  visitedViews: [],
  cachedViews: []
}

const mutations = {
  ADD_VISITED_VIEW: (state, view) => {
    if (state.visitedViews.some(v => v.path === view.path)) return
    state.visitedViews.push(
      Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      })
    )
  },
  ADD_CACHED_VIEW: (state, view) => {
    if (state.cachedViews.includes(view.name)) return
    if (!view.meta.noCache) {
      state.cachedViews.push(view.name)
    }
  },

  DEL_VISITED_VIEW: (state, view) => {
    for (const [i, v] of state.visitedViews.entries()) {
      if (v.path === view.path) {
        state.visitedViews.splice(i, 1)
        break
      }
    }
  },
  DEL_CACHED_VIEW: (state, view) => {
    const index = state.cachedViews.indexOf(view.name)
    index > -1 && state.cachedViews.splice(index, 1)
  },

  DEL_OTHERS_VISITED_VIEWS: (state, view) => {
    state.visitedViews = state.visitedViews.filter(v => {
      return v.meta.affix || v.path === view.path
    })
  },
  DEL_OTHERS_CACHED_VIEWS: (state, view) => {
    const index = state.cachedViews.indexOf(view.name)
    if (index > -1) {
      state.cachedViews = state.cachedViews.slice(index, index + 1)
    } else {
      // if index = -1, there is no cached tags
      state.cachedViews = []
    }
  },

  DEL_ALL_VISITED_VIEWS: state => {
    // keep affix tags
    const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
    state.visitedViews = affixTags
  },
  DEL_ALL_CACHED_VIEWS: state => {
    state.cachedViews = []
  },

  UPDATE_VISITED_VIEW: (state, view) => {
    for (let v of state.visitedViews) {
      if (v.path === view.path) {
        v = Object.assign(v, view)
        break
      }
    }
  }
}

const actions = {
  addView({ dispatch }, view) {
    dispatch('addVisitedView', view)
    dispatch('addCachedView', view)
  },
  addVisitedView({ commit }, view) {
    commit('ADD_VISITED_VIEW', view)
  },
  addCachedView({ commit }, view) {
    commit('ADD_CACHED_VIEW', view)
  },

  delView({ dispatch, state }, view) {
    return new Promise(resolve => {
      dispatch('delVisitedView', view)
      dispatch('delCachedView', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delVisitedView({ commit, state }, view) {
    return new Promise(resolve => {
      commit('DEL_VISITED_VIEW', view)
      resolve([...state.visitedViews])
    })
  },
  delCachedView({ commit, state }, view) {
    return new Promise(resolve => {
      commit('DEL_CACHED_VIEW', view)
      resolve([...state.cachedViews])
    })
  },

  delOthersViews({ dispatch, state }, view) {
    return new Promise(resolve => {
      dispatch('delOthersVisitedViews', view)
      dispatch('delOthersCachedViews', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delOthersVisitedViews({ commit, state }, view) {
    return new Promise(resolve => {
      commit('DEL_OTHERS_VISITED_VIEWS', view)
      resolve([...state.visitedViews])
    })
  },
  delOthersCachedViews({ commit, state }, view) {
    return new Promise(resolve => {
      commit('DEL_OTHERS_CACHED_VIEWS', view)
      resolve([...state.cachedViews])
    })
  },

  delAllViews({ dispatch, state }, view) {
    return new Promise(resolve => {
      dispatch('delAllVisitedViews', view)
      dispatch('delAllCachedViews', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delAllVisitedViews({ commit, state }) {
    return new Promise(resolve => {
      commit('DEL_ALL_VISITED_VIEWS')
      resolve([...state.visitedViews])
    })
  },
  delAllCachedViews({ commit, state }) {
    return new Promise(resolve => {
      commit('DEL_ALL_CACHED_VIEWS')
      resolve([...state.cachedViews])
    })
  },

  updateVisitedView({ commit }, view) {
    commit('UPDATE_VISITED_VIEW', view)
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}

Vuex store/getter.js

const getters = {
  visitedViews: state => state.tagsView.visitedViews,
  cachedViews: state => state.tagsView.cachedViews,
}
export default getters

Vuex store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters'

Vue.use(Vuex)

const store = new Vuex.Store({
  modules,
  getters
})

export default store

页面设置 beforeRouteLeave生命周期函数定义去往哪些页面需要缓存

import store from '@/store'

beforeRouteLeave(to, from, next) {
    // 去这些界面我需要缓存
    const routerArr = []
    if (!routerArr.includes(to.name)) {
      // 不在缓存列表中，从cachedViews缓存列表中移除
      store.dispatch('tagsView/delCachedView', from)
    }
    next()
  }

缓存keep-alive组件include

keep-alive组件component动态