Javascript 无法在angular2中显示从一个组件发送到另一个组件的数组

服务--

import {Injectable} from '@angular/core';
import {UserData} from '../user-data/user-data.component';

@Injectable()
export class UserDataService {

    constructor(){}
    userdata:UserData[]; 

    getData(){
        console.log('service',this.userdata);
        return this.userdata;
    }

    setData(user:any){
        this.userdata=user;
        console.log(this.userdata);
    }
}

export class UserData {
    firstname: string;
    middlename: string;
    lastname: string;
    email: string;
    contact: number;
}

import { Component,OnInit,OnDestroy } from '@angular/core';
import { UserData } from '../../user-data/user-data.component';
import { ViewEditUser } from '../../view-edit-user/view-edit-user.component';
import {UserDataService} from '../../user-data-service/user-data-service.service';

@Component({
    selector: 'form-page',
    templateUrl: `app/add-user-sidebar/user-form/form.component.html`,
    providers:[UserDataService]
})

export class Form implements OnInit,OnDestroy {

    userdetail:UserData;
    constructor(private service:UserDataService){
    }

    addUser(first:string,middle:string,last:string,emailid:string,contactno:number){
        this.userdetail=({firstname:first,middlename:middle,lastname:last,email:emailid,contact:contactno})
        console.log(this.userdetail);
        this.service.setData(this.userdetail);  
    }

    ngOnInit(){
    }

    ngOnDestroy(){
    }
}

import { Component,Input, OnInit } from '@angular/core';
import { Form } from '../add-user-sidebar/user-form/form.component';
import {UserData} from '../user-data/user-data.component';
import { WelcomePage } from '../welcome-page/welcome-page.component';
import {UserDataService} from '../user-data-service/user-data-service.service';

@Component({
    selector:'view-edit',
    templateUrl: 'app/view-edit-user/view-edit-user.component.html',
    providers: [UserDataService]
})  

export class ViewEditUser implements OnInit {
  arraydata:any;
    constructor(private service:UserDataService){}

  // arraydata:any;
   printarray(){
       console.log(this.arraydata);
   }
    ngOnInit()
    {
        this.arraydata=this.service.getData();
        console.log("hhghdfghdf",this.arraydata);    
    }

}

用户数据类--

import {Injectable} from '@angular/core';
import {UserData} from '../user-data/user-data.component';

@Injectable()
export class UserDataService {

    constructor(){}
    userdata:UserData[]; 

    getData(){
        console.log('service',this.userdata);
        return this.userdata;
    }

    setData(user:any){
        this.userdata=user;
        console.log(this.userdata);
    }
}

export class UserData {
    firstname: string;
    middlename: string;
    lastname: string;
    email: string;
    contact: number;
}

import { Component,OnInit,OnDestroy } from '@angular/core';
import { UserData } from '../../user-data/user-data.component';
import { ViewEditUser } from '../../view-edit-user/view-edit-user.component';
import {UserDataService} from '../../user-data-service/user-data-service.service';

@Component({
    selector: 'form-page',
    templateUrl: `app/add-user-sidebar/user-form/form.component.html`,
    providers:[UserDataService]
})

export class Form implements OnInit,OnDestroy {

    userdetail:UserData;
    constructor(private service:UserDataService){
    }

    addUser(first:string,middle:string,last:string,emailid:string,contactno:number){
        this.userdetail=({firstname:first,middlename:middle,lastname:last,email:emailid,contact:contactno})
        console.log(this.userdetail);
        this.service.setData(this.userdetail);  
    }

    ngOnInit(){
    }

    ngOnDestroy(){
    }
}

import { Component,Input, OnInit } from '@angular/core';
import { Form } from '../add-user-sidebar/user-form/form.component';
import {UserData} from '../user-data/user-data.component';
import { WelcomePage } from '../welcome-page/welcome-page.component';
import {UserDataService} from '../user-data-service/user-data-service.service';

@Component({
    selector:'view-edit',
    templateUrl: 'app/view-edit-user/view-edit-user.component.html',
    providers: [UserDataService]
})  

export class ViewEditUser implements OnInit {
  arraydata:any;
    constructor(private service:UserDataService){}

  // arraydata:any;
   printarray(){
       console.log(this.arraydata);
   }
    ngOnInit()
    {
        this.arraydata=this.service.getData();
        console.log("hhghdfghdf",this.arraydata);    
    }

}

组件1--

import {Injectable} from '@angular/core';
import {UserData} from '../user-data/user-data.component';

@Injectable()
export class UserDataService {

    constructor(){}
    userdata:UserData[]; 

    getData(){
        console.log('service',this.userdata);
        return this.userdata;
    }

    setData(user:any){
        this.userdata=user;
        console.log(this.userdata);
    }
}

export class UserData {
    firstname: string;
    middlename: string;
    lastname: string;
    email: string;
    contact: number;
}

import { Component,OnInit,OnDestroy } from '@angular/core';
import { UserData } from '../../user-data/user-data.component';
import { ViewEditUser } from '../../view-edit-user/view-edit-user.component';
import {UserDataService} from '../../user-data-service/user-data-service.service';

@Component({
    selector: 'form-page',
    templateUrl: `app/add-user-sidebar/user-form/form.component.html`,
    providers:[UserDataService]
})

export class Form implements OnInit,OnDestroy {

    userdetail:UserData;
    constructor(private service:UserDataService){
    }

    addUser(first:string,middle:string,last:string,emailid:string,contactno:number){
        this.userdetail=({firstname:first,middlename:middle,lastname:last,email:emailid,contact:contactno})
        console.log(this.userdetail);
        this.service.setData(this.userdetail);  
    }

    ngOnInit(){
    }

    ngOnDestroy(){
    }
}

import { Component,Input, OnInit } from '@angular/core';
import { Form } from '../add-user-sidebar/user-form/form.component';
import {UserData} from '../user-data/user-data.component';
import { WelcomePage } from '../welcome-page/welcome-page.component';
import {UserDataService} from '../user-data-service/user-data-service.service';

@Component({
    selector:'view-edit',
    templateUrl: 'app/view-edit-user/view-edit-user.component.html',
    providers: [UserDataService]
})  

export class ViewEditUser implements OnInit {
  arraydata:any;
    constructor(private service:UserDataService){}

  // arraydata:any;
   printarray(){
       console.log(this.arraydata);
   }
    ngOnInit()
    {
        this.arraydata=this.service.getData();
        console.log("hhghdfghdf",this.arraydata);    
    }

}

组件2--

import {Injectable} from '@angular/core';
import {UserData} from '../user-data/user-data.component';

@Injectable()
export class UserDataService {

    constructor(){}
    userdata:UserData[]; 

    getData(){
        console.log('service',this.userdata);
        return this.userdata;
    }

    setData(user:any){
        this.userdata=user;
        console.log(this.userdata);
    }
}

export class UserData {
    firstname: string;
    middlename: string;
    lastname: string;
    email: string;
    contact: number;
}

import { Component,OnInit,OnDestroy } from '@angular/core';
import { UserData } from '../../user-data/user-data.component';
import { ViewEditUser } from '../../view-edit-user/view-edit-user.component';
import {UserDataService} from '../../user-data-service/user-data-service.service';

@Component({
    selector: 'form-page',
    templateUrl: `app/add-user-sidebar/user-form/form.component.html`,
    providers:[UserDataService]
})

export class Form implements OnInit,OnDestroy {

    userdetail:UserData;
    constructor(private service:UserDataService){
    }

    addUser(first:string,middle:string,last:string,emailid:string,contactno:number){
        this.userdetail=({firstname:first,middlename:middle,lastname:last,email:emailid,contact:contactno})
        console.log(this.userdetail);
        this.service.setData(this.userdetail);  
    }

    ngOnInit(){
    }

    ngOnDestroy(){
    }
}

import { Component,Input, OnInit } from '@angular/core';
import { Form } from '../add-user-sidebar/user-form/form.component';
import {UserData} from '../user-data/user-data.component';
import { WelcomePage } from '../welcome-page/welcome-page.component';
import {UserDataService} from '../user-data-service/user-data-service.service';

@Component({
    selector:'view-edit',
    templateUrl: 'app/view-edit-user/view-edit-user.component.html',
    providers: [UserDataService]
})  

export class ViewEditUser implements OnInit {
  arraydata:any;
    constructor(private service:UserDataService){}

  // arraydata:any;
   printarray(){
       console.log(this.arraydata);
   }
    ngOnInit()
    {
        this.arraydata=this.service.getData();
        console.log("hhghdfghdf",this.arraydata);    
    }

}

我是angular2的新手，我的模块中有两个组件，一个组件是用户输入数据的表单，然后将数据发送到服务，当我控制台记录时，我可以看到服务中的数据。但当我试图从第二个组件访问该阵列时，我无法访问数据，该怎么办？

---

您需要使用可观测数据在组件之间传递数据

在你的服务中创建一个主题类型变量，在你的第一个组件中做一个。接下来将数据传递给服务，在你的第二个组件中，订阅服务veriable，它将为你获取数据

---

您无法获取数据，因为JavaScript的异步行为将由可观察对象处理

如果您在每个组件上提供服务，则无法将其用于通信，因为每个组件将获得不同的服务实例

如果一个组件是另一个组件的父组件（祖先），则仅在父组件上提供它。 否则，请在两者的父组件（anjestor）上提供，或仅在

@NgModule（）

中提供，以使服务成为全局服务

您还需要注意，可能一个组件在另一个组件设置值之前读取，这取决于您设置值的位置以及组件的创建顺序。 使用

BehaviorSubject

通常可以避免这个陷阱，因为这样一来，不管是先创建哪个组件，还是一个组件试图读取，而另一个组件尚未设置值

---

要在多个实例之间共享，请参见

选中此项->您可以在服务中保留值，并尝试从服务中访问值您可以在下面的回答中看到一个实现：在特定情况下，问题是关于数字类型，但对象也是如此。这个答案详细描述了在模块中使用服务的组件之间共享数据。更多细节可以在这里找到，答案是关于同一页面上两个不同角度应用程序之间的通信。谢谢你找到了它，我最近只是在找，没找到。