HarmonyOS Navigation跳转新页面生命周期初始化问题

import { BuilderNameConstants, buildRouterModel, RouterModule, RouterNameConstants, } from '@ohos/routermodule'; 
 
import http from '@ohos.net.http'; 
 
@Builder 
export function harBuilder(value: object) { 
  NavDestination() { 
    Column() { 
      Button($r("app.string.to_harb_pageB2"), { stateEffect: true, type: ButtonType.Capsule }) 
        .width('80%') 
        .height(40) 
        .margin(20) 
        .onClick(() => { 
          buildRouterModel(RouterNameConstants.ENTRY_HAP, BuilderNameConstants.HARB_B2); 
        }) 
    } 
    .width('100%') 
    .height('100%') 
  } 
  .onShown(() => { 
    // http请求网络资源数据 
    let httpRequest = http.createHttp(); 
    httpRequest.request("your url", (err, data) => { 
      if (!err) { 
        console.info('Result:' + data.result); 
        console.info('code:' + data.responseCode); 
        console.info('header:' + JSON.stringify(data.header)); 
        console.info('cookies:' + data.cookies); // 8+ 
      } else { 
        console.info('error:' + JSON.stringify(err)); 
      } 
    }); 
  }) 
  .title('B1Page') 
  .onBackPressed(() => { 
    RouterModule.pop(RouterNameConstants.ENTRY_HAP); 
    return true; 
  }) 
} 
 
const builderName = BuilderNameConstants.HARB_B1; 
if (!RouterModule.getBuilder(builderName)) { 
  let builder: WrappedBuilder<[object]> = wrapBuilder(harBuilder); 
  RouterModule.registerBuilder(builderName, builder); 
}