如何实现一个简易版的vuex持久化工具

function dep(obj, key, options) {
 let data = obj[key]
 Object.defineProperty(obj, key, {
  configurable: true,
  get() {
   options.get()
   return data
  },
  set(val) {
   if (val === data) return
   data = val
   if(getType(data)==='object') observer(data)
   options.set()
  }
 })
}
function observer(obj, options) {
 if (getType(obj) !== 'object') throw ('参数需为object')
 Object.keys(obj).forEach(key => {
  dep(obj, key, options)
  if(getType(obj[key]) === 'object') {
   observer(obj[key], options)
  }
 })
}

function dep(obj, key, options) {
 let data = obj[key]
 if (getType(data)==='object') {
  data[Symbol.for('parent')] = obj
  data[Symbol.for('key')] = key
 }
 Object.defineProperty(obj, key, {
  configurable: true,
  get() {
   ...
  },
  set(val) {
   if (val === data) return
   data = val
   if(getType(data)==='object') {
    data[Symbol.for('parent')] = obj
    data[Symbol.for('key')] = key
    observer(data)
   }
   ...
  }
 })
}

function getStoragePath(obj, key) {
 let storagePath = [key]
 while (obj) {
  if (obj[Symbol.for('key')]) {
   key = obj[Symbol.for('key')]
   storagePath.unshift(key)
  }
  obj = obj[Symbol.for('parent')]
 }
 // storagePath[0]就是根节点，storagePath记录了从根节点到变动节点的路径
 return storagePath 
}

/*
持久化相关内容
*/
// 重写的Array方法
const funcArr = ['push', 'pop', 'shift', 'unshift', 'splice', 'sort', 'reverse']
const typeArr = ['object', 'array']

function setCallBack(obj, key, options) {
 if (options && options.set) {
  if (getType(options.set) !== 'function') throw ('options.set需为function')
  options.set(obj, key)
 }
}

function rewriteArrFunc(arr, options) {
 if (getType(arr) !== 'array') throw ('参数需为array')
 funcArr.forEach(key => {
  arr[key] = function(...args) {
   this.__proto__[key].call(this, ...args)
   setCallBack(this[Symbol.for('parent')], this[Symbol.for('key')], options)
  }
 })
}

function dep(obj, key, options) {
 let data = obj[key]
 if (typeArr.includes(getType(data))) {
  data[Symbol.for('parent')] = obj
  data[Symbol.for('key')] = key
 }
 Object.defineProperty(obj, key, {
  configurable: true,
  get() {
   if (options && options.get) {
    options.get(obj, key)
   }
   return data
  },
  set(val) {
   if (val === data) return
   data = val
   let index = typeArr.indexOf(getType(data))
   if (index >= 0) {
    data[Symbol.for('parent')] = obj
    data[Symbol.for('key')] = key
    if (index) {
     rewriteArrFunc(data, options)
    } else {
     observer(data, options)
    }
   }
   setCallBack(obj, key, options)
  }
 })
}

function observer(obj, options) {
 if (getType(obj) !== 'object') throw ('参数需为object')
 let index
 Object.keys(obj).forEach(key => {
  dep(obj, key, options)
  index = typeArr.indexOf(getType(obj[key]))
  if (index < 0) return
  if (index) {
   rewriteArrFunc(obj[key], options)
  } else {
   observer(obj[key], options)
  }
 })
}
function debounceStorage(state, fn, delay) {
 if(getType(fn) !== 'function') return null
 let updateItems = new Set()
 let timer = null
 return function setToStorage(obj, key) {
  let changeKey = getStoragePath(obj, key)[0]
  updateItems.add(changeKey)
  clearTimeout(timer)
  timer = setTimeout(() => {
   try {
    updateItems.forEach(key => {
     fn.call(this, key, state[key])
    })
    updateItems.clear()
   } catch (e) {
    console.error(`persistent.js中state内容持久化失败,错误位于[${changeKey}]参数中的[${key}]项`)
   }
  }, delay)
 }
}
export function getStoragePath(obj, key) {
 let storagePath = [key]
 while (obj) {
  if (obj[Symbol.for('key')]) {
   key = obj[Symbol.for('key')]
   storagePath.unshift(key)
  }
  obj = obj[Symbol.for('parent')]
 }
 return storagePath
}
export function persistedState({state, setItem, getItem, setDelay=0, getDelay=0}) {
 observer(state, {
  set: debounceStorage(state, setItem, setDelay),
  get: debounceStorage(state, getItem, getDelay)
 })
}
/*
vuex自动配置mutation相关方法
*/
export function setMutations(stateReplace, mutationsReplace) {
 Object.keys(stateReplace).forEach(key => {
  let name = key.replace(/\w/, (first) => `update${first.toUpperCase()}`)
  let replaceState = (key, state, payload) => {
   state[key] = payload
  }
  mutationsReplace[name] = (state, payload) => {
   replaceState(key, state, payload)
  }
 })
}
/*
通用方法
*/
export function getType(para) {
 return Object.prototype.toString.call(para)
  .replace(/\[object (.+?)\]/, '$1').toLowerCase()
}

import {persistedState} from '../common/tools.js'
...
...
// 因为是uni-app小程序，持久化是调用uni.setStorageSync，网页就用localStorage.setItem
persistedState({state, setItem: uni.setStorageSync, setDelay: 1000})