HarmonyOS 浏览器 Web 组件如何获取缓存数据大小或缓存数据明细，如何删除本地缓存数据？

可以通过removeCache()接口清除已经缓存的资源，参考demo:

struct WebComponent {
  @State mode: CacheMode = CacheMode.None;
  controller: web_webview.WebviewController = new web_webview.WebviewController();

  build() {
    Column() {
      Button('removeCache')
        .onClick(() => {
          try { // 设置为true时同时清除rom和ram中的缓存，设置为false时只清除ram中的缓存 this.controller.removeCache(true); } catch (error) {
            let e: business_error.BusinessError = error as business_error.BusinessError;
            console.error(`ErrorCode: ${e.code}, Message: ${e.message}`);
          }
        })
      Web({ src: 'www.huawei.com', controller: this.controller })
        .cacheMode(this.mode)
    }
  }
} 

可以参考缓存方案文档https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/web-cookie-and-data-storage-mgmt-V5