HarmonyOS 关于router.back()

import {MainPage5} from '../mainpage5/MainPage5' 
import {MainPage6} from '../mainpage6/MainPage6' 
@Entry({ routeName: 'MainPage4' }) 
@Component 
export struct MainPage4 { 
 @State message: string = 'MainPage4'; 
 @Provide('pageStack') pageStack: NavPathStack = new NavPathStack(); 
 @State data: string = '还没收到' 
 @StorageLink('data') data2: string = ''; 
 
 @Builder pageMap(name: string) { 
  if (name ==='MainPage5'){ 
   MainPage5() 
  }else if (name === 'MainPage6') { 
   MainPage6() 
  } 
 } 
 build() { 
  Navigation(this.pageStack){ 
   Column() { 
    Text('返回的数据:'+this.data) 
    Text('返回的数据2:'+this.data2) 
    Text(this.message+'  TOMainPage5') 
     .fontSize(15) 
     .fontWeight(FontWeight.Bold) 
     .onClick(() => { 
      let pathInfo : NavPathInfo = new NavPathInfo('MainPage5', "4传递给5的数据", (popInfo: PopInfo) => { 
       //返回的数据 
       this.data = popInfo.result as string 
      }) 
      this.pageStack.pushDestination(pathInfo, true); 
     }) 
 
    Text(this.message+'  TOMainPage6') 
     .fontSize(15) 
     .fontWeight(FontWeight.Bold) 
     .onClick(() => { 
      let pathInfo : NavPathInfo = new NavPathInfo('MainPage6', "4传递给6的数据", (popInfo: PopInfo) => { 
       this.data = popInfo.result as string 
      }) 
      this.pageStack.pushDestination(pathInfo, true); 
     }) 
   } 
   .width('100%') 
 
  } 
  .navDestination(this.pageMap) 
  .title("根页面MainPage4") 
 } 
}
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@Component 
export struct MainPage5 { 
 @State message: string = 'MainPage5'; 
 @Consume('pageStack') pageStack: NavPathStack; 
 @State data: string = '' 
 
 build() { 
  NavDestination() { 
   Text('MainPage5') 
   Text('传递的数据:'+this.data) 
   Button('5到6', { stateEffect: true, type: ButtonType.Capsule }) 
    .width('80%') 
    .height(40) 
    .margin(20) 
    .onClick(()=>{ 
     let pathInfo : NavPathInfo = new NavPathInfo('MainPage6', "5传递给6的数据", (popInfo: PopInfo) => { 
      this.data = popInfo.result as string 
     }) 
     this.pageStack.pushPath(pathInfo,true) 
    }) 
  } 
  .onBackPressed(()=>{ 
   const popDestinationInfo = this.pageStack.pop("5返回上页的数据",true) 
   console.log('pop' + '返回值' + JSON.stringify(popDestinationInfo)) 
   return true 
  }) 
  .onReady(( cxt )=>{ 
   console.log('②当NavDestination即将构建子组件之前会触发此回调') 
   //获取页面传递来的数据=>方式1 
   //this.data = cxt.pathInfo.param as string 
   //方式2 
   this.data = this.pageStack.getParamByIndex(this.pageStack.getAllPathName().length-1) as string 
  }) 
 } 
}
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@Component 
export struct MainPage6 { 
 @State message: string = 'MainPage6'; 
 @Consume('pageStack') pageStack: NavPathStack; 
 @State data: string = '' 
 
 build() { 
  NavDestination() { 
   Text('MainPage6') 
   Text('传递的数据:'+this.data) 
   Button('6到4', { stateEffect: true, type: ButtonType.Capsule }) 
    .width('80%') 
    .height(40) 
    .margin(20) 
    .onClick(()=>{ 
     console.log('6-4') 
     //清除栈回到首页 
     this.pageStack.clear() 
     AppStorage.setOrCreate("data","data") 
    }) 
  } 
  .onBackPressed(()=>{ 
   const popDestinationInfo = this.pageStack.pop("6返回上页的数据",true) 
   console.log('pop' + '返回值' + JSON.stringify(popDestinationInfo)) 
   return true 
  }) 
  .onReady(( cxt )=>{ 
   console.log('②当NavDestination即将构建子组件之前会触发此回调') 
   //获取页面传递来的数据=>方式1 
   //this.data = cxt.pathInfo.param as string 
   //方式2 
   this.data = this.pageStack.getParamByIndex(this.pageStack.getAllPathName().length-1) as string 
  }) 
 } 
}
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