开发过程
在卡片中使用postCardAction接口的router能力，能够快速拉起卡片提供方应用的指定UIAbility，因此UIAbility较多的应用往往会通过卡片提供不同的跳转按钮，实现一键直达的效果。

创建新的UI页面show.ets

代码示例：
WidgetCard.ets

@Entry
@Component
struct WidgetCard {
  build() {
    Column() {
      Button('routerA')
        .margin('20%')
        .onClick(() => {
          console.info('Jump to EntryAbility aPage');
          postCardAction(this, {
            'action': 'router',
            'abilityName': 'EntryAbility', // 只能跳转到当前应用下的UIAbility
            'params': {
              'targetPage': 'aPage' // 在EntryAbility中处理这个信息
            }
          });
        })

      Button('routerB')
        .margin('20%')
        .onClick(() => {
          console.info('Jump to EntryAbility bPage');
          postCardAction(this, {
            'action': 'router',
            'abilityName': 'EntryAbility', // 只能跳转到当前应用下的UIAbility
            'params': {
              'targetPage': 'bPage' // 在EntryAbility中处理这个信息
            }
          });
        })
    }
    .width('100%')
    .height('100%')
  }
}

在EntryAbility.ts中回调函数

import UIAbility from '@ohos.app.ability.UIAbility';
import hilog from '@ohos.hilog';
import window from '@ohos.window';

let selectPage = "";
let currentWindowStage = null;

export default class EntryAbility extends UIAbility {
  onCreate(want, launchParam) {
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');

    // 获取router事件中传递的targetPage参数
    console.info("onCreate want:" + JSON.stringify(want));
    if (want.parameters.params !== undefined) {
      let params = JSON.parse(want.parameters.params);
      console.info("onCreate router targetPage:" + params.targetPage);
      selectPage = params.targetPage;
    }
  }

  // 如果UIAbility已在后台运行，在收到Router事件后会触发onNewWant生命周期回调
  onNewWant(want, launchParam) {
    console.info("onNewWant want:" + JSON.stringify(want));
    if (want.parameters.params !== undefined) {
      let params = JSON.parse(want.parameters.params);
      console.info("onNewWant router targetPage:" + params.targetPage);
      selectPage = params.targetPage;
    }
    if (currentWindowStage != null) {
      this.onWindowStageCreate(currentWindowStage);
    }
  }

  onDestroy() {
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onDestroy');
  }

  onWindowStageCreate(windowStage: window.WindowStage) {
    // Main window is created, set main page for this ability
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate');
    let targetPage;
    // 根据传递的targetPage不同，选择拉起不同的页面
    switch (selectPage) {
      case 'aPage':
        targetPage = 'pages/Index';
        break;
      case 'bPage':
        targetPage = 'pages/Show';
        break;
      default:
        targetPage = 'pages/Index';
    }
    if (currentWindowStage === null) {
      currentWindowStage = windowStage;
    }
    windowStage.loadContent(targetPage, (err, data) => {
      if (err && err.code) {
        console.info('Failed to load the content. Cause: %{public}s', JSON.stringify(err));
        return;
      }
    });
  }

  onWindowStageDestroy() {
    // Main window is destroyed, release UI related resources
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageDestroy');
  }

  onForeground() {
    // Ability has brought to foreground
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onForeground');
  }

  onBackground() {
    // Ability has back to background
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onBackground');
  }
}

*附件：ArkTS语言HarmonyOSOpenHarmony应用开发-router事件跳转到指定UIAbility.docx