80 lines
1.7 KiB
TypeScript
80 lines
1.7 KiB
TypeScript
const DEFAULT_CACHE_EXPIRY_TIME = 5 * 60 * 1000; // 默认缓存有效期为5分钟
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/**
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* 通用缓存工具类
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*/
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class Cache {
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private cachePrefix: string;
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constructor(prefix: string = "cache_") {
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this.cachePrefix = prefix;
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}
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/**
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* 设置缓存
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*
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* @param key 缓存的键
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* @param data 缓存的数据
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* @param expiryTime 缓存有效期（毫秒），默认5分钟
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*/
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setCache(
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key: string,
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data: any,
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expiryTime: number = DEFAULT_CACHE_EXPIRY_TIME
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) {
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const expiryTimestamp = new Date().getTime() + expiryTime;
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const cacheKey = this.cachePrefix + key;
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const cacheData = { data, expiryTimestamp };
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localStorage.setItem(cacheKey, JSON.stringify(cacheData));
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}
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/**
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* 获取缓存
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*
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* @param key 缓存的键
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* @returns 如果缓存有效则返回缓存的数据，否则返回 null
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*/
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getCache(key: string) {
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const cacheKey = this.cachePrefix + key;
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const cached = localStorage.getItem(cacheKey);
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if (cached) {
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const { data, expiryTimestamp } = JSON.parse(cached);
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const now = new Date().getTime();
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// 如果缓存未过期，返回数据
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if (now < expiryTimestamp) {
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return data;
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} else {
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// 如果缓存过期，移除缓存
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localStorage.removeItem(cacheKey);
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}
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}
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return null;
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}
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/**
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* 移除缓存
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*
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* @param key 缓存的键
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*/
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removeCache(key: string) {
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const cacheKey = this.cachePrefix + key;
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localStorage.removeItem(cacheKey);
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}
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/**
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* 清空当前前缀下的所有缓存
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*/
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clearCache() {
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for (const key in localStorage) {
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if (key.startsWith(this.cachePrefix)) {
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localStorage.removeItem(key);
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}
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}
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}
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}
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export default Cache;
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