HarmonyOS 清除Web缓存

export class GlobalContext { 
  private constructor() { 
  } 
 
  private static instance: GlobalContext; 
  private _objects = new Map<string, Object>(); 
 
  public static getContext(): GlobalContext { 
    if (!GlobalContext.instance) { 
      GlobalContext.instance = new GlobalContext(); 
    } 
    return GlobalContext.instance; 
  } 
 
  getObject(value: string): Object | undefined { 
    return this._objects.get(value); 
  } 
 
  setObject(key: string, objectClass: Object): void { 
    this._objects.set(key, objectClass); 
  } 
} 
//某一个web组件赋值给全局 
Web({ src: 'https://www.huawei.com', controller: this.webcontroller }) 
  .onControllerAttached(() => { 
    GlobalContext.getContext().setObject('webcontroller', this.webcontroller) 
  }) 
  .height(200) 
  .width('100%') 
 
//清除缓存 
Button('removeCache') 
  .onClick(() => { 
    try { 
      let webcontroller = GlobalContext.getContext().getObject('webcontroller') as web_webview.WebviewController 
      webcontroller.removeCache(true); 
    } catch (error) { 
      let e: BusinessError = error as BusinessError; 
      console.error(`ErrorCode: ${e.code},  Message: ${e.message}`); 
    } 
  })