获取缓存大小与清除 Web 缓存 - 鸿蒙 HarmonyOS Next

针对浏览器 Web 组件清除缓存相关,具体实现如下 code 实例所示:

/*公共方法类*/
export class PublicUtils {
  /*获取缓存大小*/
  static async getCacheSize(): Promise<number> {
    try {
      let bundleStats = await storageStatistics.getCurrentBundleStats()
      let size = bundleStats.cacheSize / 1024 / 1024
      return Math.round(size)
    } catch (e) {
      console.error(`[PublicUtils] - 获取缓存大小: ErrorCode: ${e.code},  Message: ${e.message}`);
      return 0
    }
  }


  /*清除 Web 浏览器缓存(单个 Web 组件) Rom & Ram*/
  static clearWebCache(webView: web_webview.WebviewController, state: boolean): string {
    if (webView) {
      if (state) { // Rom & Ram: 本地 loc 和 缓存
        try {
          webView.removeCache(true);
          return '浏览器缓存清除成功';
        } catch (error) {
          let e: business_error.BusinessError = error as business_error.BusinessError;
          console.error(`[PublicUtils] - 清除缓存: ErrorCode: ${e.code},  Message: ${e.message}`);
          return '浏览器缓存清除失败:' + e.message;
        }
      } else { // Ram: 仅缓存
        try {
          webView.removeCache(false);
          return '浏览器缓存清除成功';
        } catch (error) {
          let e: business_error.BusinessError = error as business_error.BusinessError;
          console.error(`[PublicUtils] - 清除缓存: ErrorCode: ${e.code},  Message: ${e.message}`);
          return '浏览器缓存清除失败:' + e.message;
        }
      }
    } else {
      return '浏览器缓存清除失败: 无效的组件';
    }
  }
}

import { PublicUtils } from '../utils/PublicUtils'

// 获取缓存
PublicUtils.getCacheSize().then((res) => {
  console.log('[获取缓存]: ', res)
  this.detail = res.toString()
})

// 清除缓存
PublicUtils.clearWebCache(this.webView, state);

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