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// 默认缓存期限为7天
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const DEFAULT_CACHE_TIME = 60 * 60 * 24 * 7
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/**
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* 创建本地缓存对象
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* @param {string=} prefixKey -
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* @param {object} [storage=localStorage] - sessionStorage | localStorage
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*/
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export default class Storage {
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private storage: globalThis.Storage
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private prefixKey?: string
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constructor(prefixKey = '', storage = localStorage) {
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this.storage = storage
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this.prefixKey = prefixKey
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}
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private getKey(key: string) {
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return `${this.prefixKey}${key}`.toUpperCase()
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}
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/**
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* @description 设置缓存
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* @param {string} key 缓存键
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* @param {*} value 缓存值
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* @param expire
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*/
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set(key: string, value: any, expire: number | null = DEFAULT_CACHE_TIME) {
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const stringData = JSON.stringify({
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value,
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expire: expire !== null ? new Date().getTime() + expire * 1000 : null,
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})
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this.storage.setItem(this.getKey(key), stringData)
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}
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/**
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* 读取缓存
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* @param {string} key 缓存键
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* @param {*=} def 默认值
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*/
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get(key: string, def: any = null) {
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const item = this.storage.getItem(this.getKey(key))
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if (item) {
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try {
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const data = JSON.parse(item)
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const { value, expire } = data
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// 在有效期内直接返回
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if (expire === null || expire >= Date.now())
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return value
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this.remove(key)
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}
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catch (e) {
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return def
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}
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}
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return def
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}
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/**
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* 从缓存删除某项
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* @param {string} key
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*/
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remove(key: string) {
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this.storage.removeItem(this.getKey(key))
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}
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/**
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* 清空所有缓存
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* @memberOf Cache
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*/
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clear(): void {
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this.storage.clear()
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}
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/**
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* 设置cookie
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* @param {string} name cookie 名称
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* @param {*} value cookie 值
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* @param {number=} expire 过期时间
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* 如果过期时间未设置，默认关闭浏览器自动删除
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* @example
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*/
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setCookie(name: string, value: any, expire: number | null = DEFAULT_CACHE_TIME) {
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document.cookie = `${this.getKey(name)}=${value}; Max-Age=${expire}`
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}
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/**
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* 根据名字获取cookie值
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* @param name
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*/
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getCookie(name: string): string {
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const cookieArr = document.cookie.split('; ')
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for (let i = 0, length = cookieArr.length; i < length; i++) {
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const kv = cookieArr[i].split('=')
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if (kv[0] === this.getKey(name))
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return kv[1]
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}
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return ''
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}
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/**
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* 根据名字删除指定的cookie
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* @param {string} key
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*/
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removeCookie(key: string) {
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this.setCookie(key, 1, -1)
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}
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/**
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* 清空cookie，使所有cookie失效
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*/
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clearCookie(): void {
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const keys = document.cookie.match(/[^ =;]+(?==)/g)
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if (keys) {
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for (let i = keys.length; i--;)
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document.cookie = `${keys[i]}=0;expire=${new Date(0).toUTCString()}`
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}
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}
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}
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export const storage = new Storage('')
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