H5

framework/8-cache.js

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+/**  
+ * 获取缓存
+ * @author NanQi
+ * @param {String} key 缓存键 
+ * @return {String} 缓存值
+ */
+function get(key) {
+    try {
+        let res = uni.getStorageSync(key)
+
+        if (!res) {
+            return ''
+        }
+
+        // res = JSON.parse(res)
+
+        if (res.__expiretime && res.__expiretime < uni.utils.timestamp()) {
+			remove(key)
+            return ''
+        } else {
+            return res
+        }
+    } catch (e) {
+        return ''
+    }
+}
+
+
+/**  
+ * 获取StorageData缓存
+ * @author NanQi
+ * @param {String} key 缓存键 
+ * @return {String} 缓存值
+ */
+function getStorageData(key) {
+    try {
+        let res = uni.getStorageSync(key);
+
+        if (!res) {
+            return ''
+        }
+
+        res = JSON.parse(res)
+
+        return res.data
+    } catch (e) {
+        return ''
+    }
+}
+
+/**  
+ * 设置缓存
+ * @author NanQi
+ * @param {String} key 缓存键 
+ * @param {String} value 缓存值
+ * @param {Number} expire 指定秒数后过期
+ * @return void
+ */
+function set(key, value, expire = uni.conf.default_expire) {
+    let cacheItem = {}
+    cacheItem = value
+	// console.log(cacheItem)
+    if (expire > 0) {
+        cacheItem.__expiretime = uni.utils.timestamp() + expire
+    }
+    // uni.setStorageSync(key,JSON.stringify(cacheItem))
+	 uni.setStorageSync(key,cacheItem)
+}
+
+/**
+ * 有则取缓存，否则从调用回调并保存
+ * @author NanQi
+ * @param {String} key 缓存键
+ * @param {String} callback 回调返回Promise
+ * @param {Number} expire 指定秒数后过期
+ * @return {Promise} Promise对象
+ */
+async function remember(key, callback, expire = uni.conf.default_expire) {
+    let ret = this.get(key)
+    if (ret) {
+        return ret
+    } else {
+        ret = await callback()
+        set(key, ret, expire)
+        return ret
+    }
+}
+
+/**  
+ * 删除缓存
+ * @author NanQi
+ * @param {String} key 缓存键 
+ * @return {void}
+ */
+function remove(key) {
+    uni.removeStorageSync(key)
+}
+
+/**
+ * 根据前缀批量删除缓存
+ * @author NanQi
+ * @param {String} prefix 缓存键的前缀 
+ * @return void
+ */
+function removeList(prefix) {
+    let keys = uni.getStorageInfoSync().keys
+    if (keys && keys.length > 0) {
+        keys.forEach(key => {
+            if (key.indexOf(prefix) === 0) {
+                uni.removeStorageSync(key)
+            }
+        })
+    }
+}
+
+function _randomRemove() {
+	const info = uni.getStorageInfoSync()
+	if (info.currentSize > 0.7 * info.limitSize
+	|| info.keys.length > uni.conf.autoRemoveCache.count 
+	|| info.currentSize > uni.conf.autoRemoveCache.size) {
+		for	(let i = 0; i < 100; i++) {
+			if (info.keys.length < 1) {
+				return
+			}
+			const key = info.keys[Math.floor(Math.random() * info.keys.length)]
+			_removeExpired(key)
+		}
+	}
+}
+
+function _removeExpired(key) {
+	let res = uni.getStorageSync(key);
+	if (!res) {
+	    return
+	}
+	
+	res = JSON.parse(res)
+	if (res.__expiretime && res.__expiretime < uni.utils.timestamp()) {
+		remove(key)
+	}
+}
+
+function _autoRemoveExpired() {
+	const info = uni.getStorageInfoSync()
+	if (info.currentSize > 0.7 * info.limitSize
+	|| info.keys.length > uni.conf.autoRemoveCache.count 
+	|| info.currentSize > uni.conf.autoRemoveCache.size) {
+		if (info.keys && info.keys.length > 0) {
+		    info.keys.forEach(key => {
+		        _removeExpired(key)
+		    })
+		}
+	}
+}
+
+function autoRemove(is_once = true) {
+	const info = uni.getStorageInfoSync()
+	if (info.currentSize > 0.9 * info.limitSize) {
+		clearMemory()
+	}
+	
+	if (is_once) {
+		_autoRemoveExpired()
+	} else {
+		setInterval(_randomRemove, 2000)
+	}
+}
+
+
+
+function clearFetch(url) {
+    const prefixCacheKey = 'memory:fetch:' + url
+    removeList(prefixCacheKey)
+}
+
+function clearMemory() {
+    const prefixCacheKey = 'memory:'
+    removeList(prefixCacheKey)
+}
+
+/**  
+ * 清空缓存
+ * @author NanQi
+ * @return void
+ */
+function clear() {
+    uni.clearStorageSync()
+}
+
+function getInfo() {
+    return uni.getStorageInfoSync()
+}
+
+uni.cache = {
+    get,
+    getStorageData,
+    set,
+    remove,
+    remember,
+    clearFetch,
+    clearMemory,
+    clear,
+    getInfo,
+	autoRemove,
+}