export let cache = new Cache()

/** * 需要緩存的數據會在mutations-type后面添加-CACHED */export const SET_HOME_INDEX = 'SET_HOME_INDEX-CACHED'/modules/home/index.jsconst actions = { /**  * @description 如果有緩存，就返回把緩存的數據，傳入mutations，  * 沒有緩存就從接口拿數據，存入緩存，把數據傳入mutations  */ async fetchAction ({commit}, {mutationType, fetchData, oPayload}) {  // vuex開啟了命名空間，所這里從cachekey要把命名空間前綴 + type + 把payload格式化成JSON  const cacheKey = NAMESPACE + mutationType + JSON.stringify(oPayload)  const cacheResponse = cache.get(cacheKey || '')  if (!cacheResponse) {   const [err, response] = await fetchData()   if (err) {    console.error(err, 'error in fetchAction')    return false   }   commit(mutationType, {response: response, oPayload})  } else {   console.log('已經進入緩存取數據！！！')   commit(mutationType, {response: cacheResponse, oPayload})  } }, loadHomeData ({ dispatch, commit }) {  dispatch(   'fetchAction',   {    mutationType: SET_HOME_INDEX,    fetchData: api.index,   }  ) }}const mutations = { [SET_HOME_INDEX] (state, {response, oPayload}) {},}const state = { indexData: {}}export default { namespaced: NAMESPACED, actions, state, getters, mutations}

import cache from 'src/store/util/CacheOfStore'// import {strOfPayloadQuery} from 'src/store/util/index'/** * 在每次mutations提交之后，把mutations-type后面有CACHED標志的數據存入緩存， * 現在key值是mutations-type * 問題： * 沒辦法區分不同參數query的請求， * * 方法1: 用每個mutations-type + payload的json格式為key來緩存數據 */function cachePlugin () { return store => {  store.subscribe(({ type, payload }, state) => {   // 需要緩存的數據會在mutations-type后面添加CACHED   const needCache = type.split('-').pop() === 'CACHED'   if (needCache) {    // 這里的type會自動加入命名空間所以 cacheKey = type + 把payload格式化成JSON    const cacheKey = type + JSON.stringify(payload && payload.oPayload)    const cacheResponse = cache.get(cacheKey)    // 如果沒有緩存就存入緩存    if (!cacheResponse) {     cache.set(cacheKey, payload.response)    }   }   console.log(cache)  }) }}const plugin = cachePlugin()export default plugin

import Vue from 'vue'import Vuex from 'vuex'import home from './modules/home'import cachePlugin from './plugins/cache'Vue.use(Vuex)const store = new Vuex.Store({ modules: {  home,  editActivity,  editGuide } plugins: [cachePlugin]})export default store

const actions = { async loadHomeData ({ dispatch, commit }, oPayload) {  commit(SET_HOME_LOADSTATUS)  const [err, response] = await fetchOrCache({   api: api.index,   queryArr: oPayload.queryArr,   mutationType: SET_HOME_INDEX  })  if (err) {   console.log(err, 'loadHomeData error')   return [err, response]  }  commit(SET_HOME_INDEX, { response })  return [err, response] }}

/** * 用這個函數就說明是需要進入緩存 * @param {*} api 請求的接口 * @param {*} queryArr 請求的參數 * @param {*} mutationType 傳入mutationType作為cache的key值 */export async function fetchOrCache ({api, queryArr, mutationType, diff}) { // 這里是請求接口 const fetch = httpGet(api, queryArr) const cachekey = `${mutationType}:${JSON.stringify(queryArr)}` if (cache.has(cachekey)) {  const obj = cache.get(cachekey)  if (cacheFresh(obj.cacheTimestemp, diff)) {   return cloneDeep(obj)  } else {   // 超時就刪除   cache.delete(cachekey)  } } // 不取緩存的處理 let response = await fetch() // 時間戳綁定在數組的屬性上 response.cacheTimestemp = Date.now() cache.set(cachekey, response) // 返回cloneDeep的對象 return cloneDeep(response)}/** * 判斷緩存是否失效 * @param {*} diff 失效時間差，默認15分鐘=900s */const cacheFresh = (cacheTimestemp, diff = 900) => { if (cacheTimestemp) {  return ((Date.now() - cacheTimestemp) / 1000) <= diff } else {  return true }}