HarmonyOS ArkWeb如何实现下拉刷新功能

import web_webview from '@ohos.web.webview' 
import { PullToRefresh } from '@ohos/pulltorefresh' 
 
@Entry 
@Component 
struct Index { 
  controller: web_webview.WebviewController = new web_webview.WebviewController() 
  @State dataArray: Array<string> = [] 
  private scroller: Scroller = new Scroller() 
 
  @Builder 
  getContentView() { 
    Column() { 
      Text("heeerfhtsgbsrgsxg") 
      Text("heeerfhtsgbsrgsxg") 
      Text("heeerfhtsgbsrgsxg") 
      Text("heeerfhtsgbsrgsxg") 
      Web({ src: 'http://www.huawei.com', controller: this.controller }) 
    } 
    .width('100%') 
    .height('100%') 
  } 
 
  build() { 
    Scroll(this.scroller) { 
      PullToRefresh( 
        { 
          // 必传项，列表组件所绑定的数据,不是列表传个空数据 
          data: this.dataArray, 
          // 必传项，需绑定传入主体布局 
          scroller: this.scroller, 
          // 必传项，自定义主体布局 
          customList: () => { 
            // 一个用@Builder修饰过的UI方法 
            this.getContentView() 
          }, 
          // 可选项，下拉刷新回调 
          onRefresh: () => { 
            return new Promise<string>((resolve, reject) => { 
              setTimeout(() => { 
                resolve('刷新成功'); 
              }, 1000); 
            }); 
          }, 
        }) 
        .width('100%') 
        .height('100%') 
    } 
    .width('100%') 
    .height('100%') 
  } 
}