如何实现路由的动态跳转呢

import { router } from '@kit.ArkUI';

@Entry
@Component
struct Index {
  @State message: string = 'A页面';
  @State urlString: string = 'pages/Index02'; // 原本要跳转的页面B

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
        Button('点我跳转B')
          .onClick(() => {
            // 在跳转之前获取到实际要跳转的页面C
            this.urlString = 'pages/Index03';
            router.pushUrl({ url: this.urlString });
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}