HarmonyOS 清除缓存功能

export function clearCache(context:common.UIAbilityContext) { 
  let cacheDir = context.cacheDir 
 
  fs.listFile(cacheDir).then((filenames) => { 
    for (let i = 0;i < filenames.length; i++) { 
      let dirPath =cacheDir+filenames[i] 
      // 判断是否文件夹 
      let isDirectory:boolean = false 
      try { 
        isDirectory = fs.statSync(dirPath).isDirectory() 
      } 
      catch (e) { 
        console.log(e) 
      } 
 
      if (isDirectory) { 
        fs.rmdirSync(dirPath) 
      } else { 
        fs.unlink(dirPath).then(() => { 
          console.info('remove file succeed'); 
        }).catch((err:BusinessError) => { 
          console.info("remove file failed with error message: " + err.message + ", error code: " + err.code); 
        }); 
      } 
    } 
 
  }) 
}