【使用onPageshow等生命周期函数】

在entry/src/main/ets/pages路径下创建Page1.ets:

import router from '@ohos.router'
@Entry
@Component
struct Page1 {@State message: string = 'Hello World'@State show: boolean=trueaboutToAppear(){console.log('Page1组件创建实例')}aboutToDisappear(){console.log('Page1组件销毁')}onPageShow(){console.log('page1页面展示')}onPageHide(){console.log("page1页面隐藏")}build() {Column() {Button('show').onClick(()=>{this.show=!this.show})if (this.show){ComponentA()}Button('跳转到Page2').onClick(()=>{router.pushUrl({url:"pages/Page2"})})Button('跳转到Page3').onClick(()=>{router.replaceUrl({url:"pages/Page3"})})}.width('100%').height('100%')}
}
@Component
struct ComponentA{aboutToAppear(){console.log('componentA组件创建实例')}aboutToDisappear(){console.log('componentA组件销毁');}build(){Text('compontent A')}
}

在entry/src/main/ets/pages路径下同样创建Page2.ets和Page3.ets:

1.Page2.ets内容：

@Entry
@Component
struct Page2 {@State message: string = 'Page2内容'onPageShow(){console.log('page2页面展示')}onPageHide(){console.log("page2页面隐藏")}onBackPress(){console.log("Page2页面返回")}build() {Row() {Column() {Text(this.message).fontSize(50).fontWeight(FontWeight.Bold)}.width('100%')}.height('100%')}
}

2.Page3.ets内容：

@Entry
@Component
struct Page3 {@State message: string = 'Page3内容'onPageShow(){console.log('page3页面展示')}onPageHide(){console.log("page3页面隐藏")}build() {Row() {Column() {Text(this.message).fontSize(50).fontWeight(FontWeight.Bold)}.width('100%')}.height('100%')}
}

在下边点击Log->HiLog，中间最左边的下拉菜单选择Phone，查看效果，如图：