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app/utils/cache.js

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+import { EXPIRE } from '../config/app';
+
+class Cache {
+	
+	constructor(handler) {
+	    this.cacheSetHandler = uni.setStorageSync;
+		this.cacheGetHandler = uni.getStorageSync;
+		this.cacheClearHandler = uni.removeStorageSync;
+		this.cacheExpire = '_expire_2019_12_17_18_44';
+	}
+	
+	/**
+	 * 获取当前时间戳
+	 */
+	time()
+	{
+		return Math.round(new Date() / 1000);
+	}
+	
+	/**
+	 * 设置过期时间缓存
+	 * @param {Object} key
+	 * @param {Object} expire
+	 */
+	setExpireCahe(key,expire)
+	{
+		expire = expire !== undefined ? expire : EXPIRE;
+		if (expire) {
+			this.cacheSetHandler(key + this.cacheExpire,this.time() + expire)
+		}
+	}
+	
+	/**
+	 * 缓存是否过期,过期自动删除
+	 * @param {Object} key
+	 * @param {Object} $bool true = 删除,false = 不删除
+	 */
+	getExpireCahe(key,$bool)
+	{
+		try{
+			let time = this.cacheGetHandler(key + this.cacheExpire);
+			if (time) {
+				let newTime = parseInt(time);
+				if (time && time < this.time() && !Number.isNaN(newTime)) {
+					if ($bool === undefined || $bool === true) {
+						this.cacheClearHandler(key);
+						this.cacheClearHandler(key + this.cacheExpire);
+					}
+					return false;
+				} else
+					return true;
+			} else {
+				return !!this.cacheGetHandler(key);
+			}
+		}catch(e){
+			return false;
+		}
+	}
+	
+	/**
+	 * 设置缓存
+	 * @param {Object} key
+	 * @param {Object} data
+	 */
+	set(key,data,expire){
+		if(typeof data === 'object')
+			data = JSON.stringify(data);
+		try{
+			this.setExpireCahe(key,expire);
+			return this.cacheSetHandler(key,data);
+		}catch(e){
+			return false;
+		}
+	}
+	
+	/**
+	 * 检测缓存是否存在
+	 * @param {Object} key
+	 */
+	has(key)
+	{
+		return this.getExpireCahe(key);
+	}
+	
+	/**
+	 * 获取缓存
+	 * @param {Object} key
+	 * @param {Object} $default
+	 * @param {Object} expire
+	 */
+	get(key,$default,expire){
+		try{
+			let isBe = this.getExpireCahe(key);
+			let data = this.cacheGetHandler(key);
+			if (data && isBe) {
+				if (typeof $default === 'boolean')
+					return JSON.parse(data);
+				else
+					return data;
+			} else {
+				if (typeof $default === 'function') {
+					let value = $default();
+					this.set(key,value,expire);
+					return value;
+				} else {
+					this.set(key,$default,expire);
+					return $default;
+				}
+			}
+		}catch(e){
+			return null;
+		}
+	}
+	
+	/**
+	 * 删除缓存
+	 * @param {Object} key
+	 */
+	clear(key)
+	{
+		try{
+			let cahceValue = this.cacheGetHandler(key + this.cacheExpire);
+			if(cahceValue)
+				this.cacheClearHandler(key + this.cacheExpire);
+			return this.cacheClearHandler(key);
+		}catch(e){
+			return false;
+		}
+	}
+	
+	/**
+	 * 清除过期缓存
+	 */
+	clearOverdue()
+	{
+		// let cacheList = uni.getStorageInfoSync(),that = this;
+		// if (typeof cacheList.keys === 'object'){
+		// 	cacheList.keys.forEach(item=>{
+		// 		that.getExpireCahe(item);
+		// 	})
+		// }
+	}
+}
+
+
+export default new Cache;