如何解决这个问题。
在具有两种类型错误控制台中
1)对象可能“未定义”。
=〉error in code --〉this.navigationExtras.state.value = item;
2)属性“value”来自索引签名，因此必须使用[“value”]访问它。
=〉error in code --〉this.navigationExtras.state.value = item;

list.component.ts文件

import { Component, OnInit } from '@angular/core';
import { NavigationExtras,Router} from '@angular/router'

@Component({
  selector: 'app-list',
  templateUrl: './list.component.html',
  styleUrls: ['./list.component.scss']
})
export class ListComponent implements OnInit {
 item:any;
 navigationExtras: NavigationExtras = {
   state: {
     value :null
   }
 };
  constructor(private router: Router) { }

  ngOnInit(): void {
  }

  onGotoEdit(item:any):void{
    this.navigationExtras.state.value = item; //error 
    this.router.navigate(['edit'])
  }

  onGotoSee(item:any):void{
    this.router.navigate(['details'])
  }

  onGotoDelete(item:any):void{
    alert('Deleted');
  }

}

edit.components.ts

错误在这个文件--〉类型'{ [k：字符串]：任意;}|“undefined”不能分配给类型“null”。类型“undefined”不能分配给类型“null”。
代码错误--〉this.value = navigation？.extras？.state

import { Component, OnInit } from '@angular/core';
import {Router} from '@angular/router'
@Component({
  selector: 'app-edit',
  templateUrl: './edit.component.html',
  styleUrls: ['./edit.component.scss']
})
export class EditComponent implements OnInit {
  value = null;

  constructor(private router :Router) {
    const navigation = this.router.getCurrentNavigation();
    this.value = navigation?.extras?.state;
   }

  ngOnInit(): void {
  }

}