HarmonyOS 鸿蒙Next 接入HNRouter后，onBackPressed失效，要怎么使用

HMRouter底层其实还是由Navigation实现，需要触发onBackPressed需要实现@HMLifecycle自定义生命周期，参考文档：

https://gitee.com/hadss/hmrouter/blob/master/HMRouterLibrary/README.md#生命周期标签-hmlifecycle

参考demo：

import { webview } from "@kit.ArkWeb";
import { common } from "@kit.AbilityKit";
import { HMLifecycle, HMLifecycleContext, HMRouter, HMRouterMgr, IHMLifecycle } from '@hadss/hmrouter';

let context = this as common.UIAbilityContext
let _controller: webview.WebviewController = new webview.WebviewController();

[@HMLifecycle](/user/HMLifecycle)({ lifecycleName: 'exampleLifecycle' })
export class ExampleLifecycle implements IHMLifecycle {
  lastTime: number = 0;

  onBackPressed(ctx: HMLifecycleContext) {
    if (_controller.accessStep(-1)) {
      _controller.backward()
      return true
    } else {
      let time = new Date().getTime();
      if (time - this.lastTime > 1000) {
        this.lastTime = time;
        ctx.uiContext.getPromptAction().showToast({
          message: '再次返回退出应用',
          duration: 1000,
        });
        return true;
      } else {
        context.terminateSelf()
        return true
      }
    }
  }
}

@Entry()
@HMRouter({ pageUrl: 'testPage', lifecycle: 'exampleLifecycle' })
@Component
export struct testPage {
  build() {
    Stack({ alignContent: Alignment.Top }) {
      Column() {
        this.webView();
      }
      .width('100%')
      .height('100%')
    }
    .width('100%')
    .height('100%')
  }

  @Builder
  private webView() {
    Web({
      src: 'https://m.baidu.com',
      controller: _controller,
    })
      .width('100%')
      .height('100%')
      .zoomAccess(false)// 不允许缩放
      .domStorageAccess(true)
      .cacheMode(CacheMode.Online)
  }
}