HarmonyOS @customDialog修饰的弹窗，在弹窗不关闭的情况下新开页面，新页面会在弹窗下层展示

如果想实现所说的应用场景，使用模态弹窗可能会更合适。可参考文档：

https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/arkts-modal-transition-V5#使用if实现模态转场

以下是参考样例代码:

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

@Entry
@Component
struct ModalTransitionTest {
  @State message: string = 'Hello World';
  @State showDialog: boolean = false

  onBackPress(): boolean | void {
    if (this.showDialog) {
      animateTo({duration: 300}, () => {
        this.showDialog = false
      })
      return true
    }
    return false
  }

  build() {
    Stack() {
      RelativeContainer() {
        Text(this.message)
          .id('ModalTransitionTestHelloWorld')
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .alignRules({
            center: { anchor: '__container__', align: VerticalAlign.Center },
            middle: { anchor: '__container__', align: HorizontalAlign.Center }
          })
          .onClick(() => {
            animateTo({duration: 300}, () => {
              this.showDialog = true
            })
          })
      }
      .height('100%')
      .width('100%')

      if (this.showDialog) {
        Column() {
          Column() {
            Text('跳转新页面')
              .fontSize(30)
              .onClick(() => {
                router.pushUrl({
                  url: 'pages/Index'
                })
              })
          }
          .backgroundColor(Color.White)
          .borderRadius(15)
          .width('80%')
          .height('40%')
          .transition(
            TransitionEffect.OPACITY.animation({ duration: 300, curve: Curve.FastOutLinearIn })
              .combine(TransitionEffect.scale({
                x: 0.3,
                y: 0.3
              }))
          )
        }
        .backgroundColor(0x44000000)
        .alignItems(HorizontalAlign.Center)
        .justifyContent(FlexAlign.Center)
        .width('100%')
        .height('100%')
        .onClick(() => {
          animateTo({duration: 300}, () => {
            this.showDialog = false
          })
        })
      }
    }
    .width('100%')
    .height('100%')
  }
}
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