first commit

common/cache.js

@@ -0,0 +1,87 @@
+/**
+ * 缓存数据优化
+ * var cache = require('utils/cache.js');
+ * import cache from '../cache'
+ * 使用方法 【
+ *     一、设置缓存
+ *         string    cache.put('k', 'string你好啊');
+ *         json      cache.put('k', { "b": "3" }, 2);
+ *         array     cache.put('k', [1, 2, 3]);
+ *         boolean   cache.put('k', true);
+ *     二、读取缓存
+ *         默认值    cache.get('k')
+ *         string    cache.get('k', '你好')
+ *         json      cache.get('k', { "a": "1" })
+ *     三、移除/清理  
+ *         移除: cache.remove('k');
+ *         清理：cache.clear(); 
+ * 】
+ * @type {String}
+ */
+var postfix = '_mallStore'; // 缓存前缀 
+/**
+ * 设置缓存 
+ * @param  {[type]} k [键名]
+ * @param  {[type]} v [键值]
+ * @param  {[type]} t [时间、单位秒]
+ */
+function put(k, v, t) {
+    uni.setStorageSync(k, v) 
+    var seconds = parseInt(t);
+    if (seconds > 0) {
+        var timestamp = Date.parse(new Date());
+        timestamp = timestamp / 1000 + seconds;
+        uni.setStorageSync(k + postfix, timestamp + "")
+    } else {
+        uni.removeStorageSync(k + postfix)
+    }
+}
+
+
+/**
+ * 获取缓存 
+ * @param  {[type]} k   [键名]
+ * @param  {[type]} def [获取为空时默认]
+ */
+function get(k, def) {
+    var deadtime = parseInt(uni.getStorageSync(k + postfix)) 
+    if (deadtime) {
+        if (parseInt(deadtime) < Date.parse(new Date()) / 1000) {
+            if (def) {
+                return def;
+            } else {
+                return false;
+            }
+        }
+    }
+    var res = uni.getStorageSync(k);
+    if (res) {
+        return res;
+    } else {
+        if (def == undefined  || def == "") {
+            def = false; 
+        }
+        return def;
+    }
+}
+
+function remove(k) {
+    uni.removeStorageSync(k);
+    uni.removeStorageSync(k + postfix);
+}
+
+/**
+ * 清理所有缓存
+ * @return {[type]} [description]
+ */
+function clear() {
+    uni.clearStorageSync();
+}
+
+
+module.exports = {
+    put: put,
+    get: get,
+    remove: remove,
+    clear: clear,
+}