HarmonyOS 怎么在页面转场时初始化web相关gpu等流程

请参考下面的demo

import webview from '@ohos.web.webview';

@Entry
@Component
struct NavigationExample {
  @Provide('pageInfos') pageInfos: NavPathStack = new NavPathStack()

  @Builder
  PageMap(name: string) {
    PageWeb()
  }

  build() {
    Navigation(this.pageInfos) {
      Column() {
        Button('go!!!', { stateEffect: true, type: ButtonType.Capsule })
          .width('80%')
          .height(40)
          .margin(20)
          .onClick(() => {
            this.pageInfos.pushPath({ name: 'pageOne' }) //将name指定的NavDestination页面信息入栈
          })
      }
    }.navDestination(this.PageMap)
  }
}



@Component
struct PageWeb {
  @State message: string = 'Hello World';
  scroller: Scroller = new Scroller()
  controller: webview.WebviewController = new webview.WebviewController();
  @State showFlag: boolean = false
  @State list:string[] = ["image","image","image","image","image","image","image","image"]
  once:boolean = true
  build() {
    NavDestination() {
      Scroll(this.scroller) {
        Column() {

          ForEach(this.list,(item:string) => {
            if(item == "image" ){
              Image("https://xxx.jpg").width(500).height(500)
            } else {
              Web({src:"https://www.huawei.com",controller:this.controller})
            }
          })
          Web({src:"about:blank",controller:new webview.WebviewController()}).height('1').width('1')
        }
      }.onScrollFrameBegin((offset,state) => {
        if(this.once){
          setTimeout(() => {
            // 模拟滑动的时候添加元素
            this.list.push("")
          },50)
          this.once =false
        }


        return {offsetRemain:offset}
      })
      .height('100%')
      .width('100%').scrollable(ScrollDirection.Vertical) // 滚动方向纵向
    }
  }
}