HarmonyOS 如何在前端页面执行应用侧class类方法中 打开加载另外一个ARKWeb本地页面

请参考示例如下:

import { webview } from '@kit.ArkWeb';
@ObservedV2
class Result {
  @Trace
  a:boolean
  constructor(a: boolean) {
    this.a = a;
  }
  open(){
    this.a = true
    console.log("111")
  }
}

@Entry
@Component
struct WebComponent {
  controller1: webview.WebviewController = new webview.WebviewController();
  controller2: webview.WebviewController = new webview.WebviewController();

  result:Result = new Result(false)
  build() {
    Stack() {
      Web({ src: $rawfile('index4.html'), controller: this.controller1 })
        .onPageEnd(() => {
          console.log("加载第一个web组件")
        })
        .javaScriptAccess(true).domStorageAccess(true).javaScriptProxy({
        object: this.result,
        name: "result",
        methodList: ["open"],
        controller: this.controller1
      })
      if (this.result.a) {
        Web({ src: $rawfile('index.html'), controller: this.controller2 })
          .onPageEnd(() => {
            console.log("加载第二个web组件")
          })
          .javaScriptAccess(true).domStorageAccess(true).mixedMode(MixedMode.All).zIndex(999)
      }
    }
  }

  onBackPress() {
    try {
      this.result.a = false
      return true
    } catch (error) {
      console.error(`ErrorCode: ${error?.code}, Message: ${error?.message}`);
    }
    return false
  }
}