const cacheUtil: any = {
 namespace: 'wait_',

 /**
 * 设置缓存
 *
 * @param {string} key (键)
 * @param {any} value (值)
 * @param {number} expire (时效时长: 秒)
 * @returns {boolean}
 */
 set(key: string, value: any, expire?: number): boolean {
 key = this.namespace + key
 let data = value
 if (expire) {
 const time: number = Math.round(new Date().getTime() / 1000)
 data = {
 expire: time + expire,
 value: value
 }
 }

 if (typeof data === 'object') {
 data = JSON.stringify(data)
 }

 try {
 window.localStorage.setItem(key, data)
 return true
 } catch (e) {
 return false
 }
 },

 /**
 * 获取缓存
 *
 * @param key (键)
 * @param isShowExpire (是否显示过期时间)
 * @returns {any}
 */
 get(key: string, isShowExpire: boolean = false): any {
 key = this.namespace + key
 const data: string | null = window.localStorage.getItem(key)
 if (data === undefined || data === null) {
 if (!isShowExpire) {
 return undefined
 }
 return { expire: undefined, value: undefined }
 }

 try {
 const time: number = Math.round(new Date().getTime() / 1000)
 const { value, expire } = JSON.parse(data)
 if (expire && expire < time) {
 window.localStorage.removeItem(key)
 return undefined
 }

 if (value) {
 if (!isShowExpire) {
 return value
 }
 return { expire, value }
 }

 const val = JSON.parse(data)
 if (val !== undefined) {
 return val
 }

 return data
 } catch (e) {
 return data
 }
 },

 /**
 * 移除缓存
 *
 * @param key (键)
 * @returns {void}
 */
 remove(key: string): void {
 key = this.namespace + key
 window.localStorage.removeItem(key)
 },

 /**
 * 清空缓存
 */
 clear(): void {
 window.localStorage.clear()
 }
}

export default cacheUtil