HarmonyOS 鸿蒙Next Web 组件怎么添加下拉刷新

可参考以下demo:

import web_webview from '[@ohos](/user/ohos).web.webview';

import { PullToRefresh } from '[@ohos](/user/ohos)/pulltorefresh'

[@Entry](/user/Entry)

[@Component](/user/Component)

struct WebPage {

 controller: web_webview.WebviewController = new web_webview.WebviewController();

 [@State](/user/State) dataArray: Array<string> = []

 private scroller: Scroller = new Scroller();

 [@Builder](/user/Builder)

 getContentView() {

   Column() {

     Web({ src: 'http://www.baidu.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: $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](/user/Builder)修饰过的UI方法,web组件定义在此[@Builder](/user/Builder)

           this.getContentView();

         },

         // 可选项，下拉刷新回调

         onRefresh: () => {

           return new Promise<string>((resolve, reject) => {

             setTimeout(() => {

               resolve('')

               // this.controller.loadUrl('https://www.baidu.com')

             }, 1000);

           });

         },

       })

         .width('100%')

       .height('100%')

     }

     .width('100%')

     .height('100%')

   }

 }