HarmonyOS 如何获取app缓存数据并且进行删除

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。

示例参考：

import fs from '@ohos.file.fs';
let cacheDir = context.cacheDir;
@Entry
@Component
struct Clear_cache {
  clearCache() {
    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);
          });
        }
      }
    })
  }
}
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