判断缓存是否为空优化改为方法

store/cashe.js

@@ -19,7 +19,6 @@ class CACHE {
 				throw (new Error('请传入缓存name值:index | {name:index}'))
 				return
 			}
-			this._isEmpty=Object.keys(data).length>=2?false:true;
 			for (let i in data) {
 				this[i] = data[i]
 				const canWrite = i.slice(0, 1) !== '_'
@@ -31,12 +30,16 @@ class CACHE {
 		}
 
 	}
+	isEmpty(){
+		return Object.keys(this).length>=2?false:true;
+	}
 	get(key) {
 		return this[key]
 	}
 	set(key, val) {
 		this[key] = val
 		uni.setStorageSync(this._name, this)
+		this._isEmpty=false
 	}
 	clear() {
 		Object.keys(this).map(v => {