Harmony数据存储工具类

使用的是mmkv

1、安装mmkv

ohpm install @ohos/mmkv

2、封装

import{MMKV, SerializeBase} from '@ohos/mmkv'/*** 数据存储工具类*/
class MMKVUtil{private filePath:string = ''private cachePath:string = ''private mmkv:MMKVprivate mmapID:string="MMKV"constructor() {this.filePath = globalThis.filesDirthis.cachePath = globalThis.cacheDirlet backupRootDir=this.filePath+"/mmkv_backup"MMKV.initialize(this.filePath+"/mmvk",this.cachePath)this.mmkv= MMKV.getBackedUpMMKVWithID(this.mmapID,MMKV.SINGLE_PROCESS_MODE,this.mmapID,backupRootDir)}/*** 存储数据：string* @param key* @param value*/saveString(key:string,value:string){this.mmkv.encode(key,value)}/*** 获取数据：boolean* @param key* @returns*/getString(ke