HarmonyOS 鸿蒙Next：使用NavPathStack传递对象时，下一个页面修改会影响到上一个页面的对象数据

提供model和model1代码如下：

```typescript
//Model.ets
export class Model{
constructor(name: string, age: number) {
this.name = name
this.age = age
}
name:string
age:number
}

//Model1.ets
import { Model } from './Model'
export class Model1{
param:Model
constructor(param: Model) {
this.param = param
}
}

//demo另外贴出
//Page01组件代码
[@Component](/user/Component)
struct Page01 {
[@Consume](/user/Consume)('pageInfos') pageInfos: NavPathStack;
[@State](/user/State) usedModel: Model | null = null;
aboutToAppear(): void {
console.log(`this.pageInfos.getParamByName('Page01'):${JSON.stringify(this.pageInfos.getParamByName('Page01'))}`)
let params = this.pageInfos.getParamByIndex(this.pageInfos.size() - 1) as Model1
if (params && params.param) {
//方法一，可行
// let name = params.param.name
// let age = params.param.age
// this.usedModel = new Model(name,age)
//方法二，可行
// this.usedModel = new Model(params.param.name, params.param.age)
//方法三，可行
let obj = JSON.stringify(params.param)
console.log(`obj: ${JSON.stringify(obj)}`)
this.usedModel = JSON.parse(obj) as Model
//直接赋值，不可行
// let obj = params.param
// this.usedModel = obj
}
if (this.usedModel) {
this.usedModel.name = '关羽'
}
}
build() {
NavDestination() {
Text(`Page 01的usedModel值为：${JSON.stringify(this.usedModel)}`)
Button('push Page03')
.width('80%')
.onClick(() => {
//将page01页面信息入栈，不传参
this.pageInfos.pushPathByName('Page03', new Model1(this.usedModel));
})
.margin({ top: 10, bottom: 10 })
}
.title('Page01')
}
}

//Page03组件代码
[@Component](/user/Component)
struct Page03 {
[@Consume](/user/Consume)('pageInfos') pageInfos: NavPathStack;
model1: Model1 | null = null;
[@State](/user/State) model: Model | null = null;
aboutToAppear(): void {
let params = this.pageInfos.getParamByIndex(this.pageInfos.size() - 1) as Model1
console.log(`this.pageInfos.getParamByName('Page03'):${JSON.stringify(this.pageInfos.getParamByName('Page03'))}`)
if (params && params.param) {
//可行
// let name = params.param.name
// let age = params.param.age
// this.model = new Model(name,age)
//可行
// this.model = new Model(params.param.name, params.param.age)
//可行
let obj = JSON.stringify(params.param)
console.log(`obj: ${JSON.stringify(obj)}`)
this.model = JSON.parse(obj) as Model
//不可行
// let obj = params.param
// this.model = obj
}
if (this.model) {
this.model.name = '张飞'
}
}
build() {
NavDestination() {
Text(`Page 03的omodel值为：${JSON.stringify(this.model)}`)
Button('push Page01')
.width('80%')
.onClick(() => {
//将page01页面信息入栈，不传参
this.pageInfos.pushPathByName('Page01', '');
})
.margin({ top: 10, bottom: 10 })
}
.title('Page03')
}
}

//IndexPage.ets(Page)
[@Entry](/user/Entry)
[@Component](/user/Component)
struct IndexPage {
[@State](/user/State) model: Model = new Model('name', 1)
[@Provide](/user/Provide)('pageInfos') pageInfos: NavPathStack = new NavPathStack()
isLogin: boolean = false;
aboutToAppear(): void {
console.log(`this.pageInfos.getParamByName('IndexPage'): ${JSON.stringify(this.pageInfos.getParamByName('IndexPage'))}`);
}
[@Builder](/user/Builder)
PagesMap(name: string) {
if (name == 'Page01') {
Page01()
} else if (name == 'Page03') {
Page03()
}
}
build() {
Navigation(this.pageInfos) {
Text(`主页的model值为：${JSON.stringify(this.model)}`)
Button('push Page01')
.width('80%')
.onClick(() => {
this.pageInfos.pushPathByName('Page01', new Model1(this.model));
})
}
.mode(NavigationMode.Stack)
.titleMode(NavigationTitleMode.Mini)
.title('主页')
.navDestination(this.PagesMap)
}
}