HarmonyOS 清除缓存功能？

Question

app中有清除缓存的需求功能，清除缓存和计算app内缓存大小需要怎么实现。

Answer 1

查询缓存用storageStatistics.getCurrentBundleStats()接口，清除文件缓存，需要调用context的cacheDir获取缓存，然后调用系统文件fs接口，判断是文件或者文件夹，再分别消除缓存https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-file-storage-statistics-V5\#storagestatisticsgetcurrentbundlestats9清理：

import fs from ‘@ohos.file.fs’;
let cacheDir = context.cacheDir;
@Entry
@Component
struct Clear_cache {
  clearCache() {
    // let cacheDir = getContext(this).cacheDir
    // fs.rmdirSync(cacheDir)
    // console.log(“delete !!!”)

    fs.listFile(cacheDir).then((filenames) => {
      for (let i = 0;i < filenames.length; i++) {
        // let dirPath = cacheDir+filenames[i]
        let dirPath = ${cacheDir}/${filenames[i]}
        // 判断是否文件夹
        let isDirectory
        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) => {
            console.info("remove file failed with error message: " + err.message + ", error code: " + err.code);
          });
        }
      }

    })
  }
}