Javascript 角度特性'$参考'；类型'中缺少；安格拉消防队员<；{}>；

我犯了这个错误

/Users/macmini/Desktop/newap/src/app/component/content/content.component.ts（18,5）：类型“AngularFireList”不可分配给类型“FirebaseListObservable”

类型“AngularFireList”中缺少属性“$ref”

组件技术

import { Component, OnInit } from '@angular/core';
import {Subscription} from 'rxjs';

import {AngularFireDatabase } from 'angularfire2/database';
import {FirebaseListObservable} from 'angularfire2/database-deprecated';

@Component({
  selector: 'app-content',
  templateUrl: './content.component.html',
  styleUrls: ['./content.component.css']
})

export class ContentComponent implements OnInit {

  courses$:FirebaseListObservable<any[]>;

  constructor(db:AngularFireDatabase){
    this.courses$ = db.list('/courses');

  }

  ngOnInit() {

  }

}

包.ison

{
  "name": "newap",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.0.0",
    "@angular/common": "^4.0.0",
    "@angular/compiler": "^4.0.0",
    "@angular/core": "^4.0.0",
    "@angular/forms": "^4.0.0",
    "@angular/http": "^4.0.0",
    "@angular/platform-browser": "^4.0.0",
    "@angular/platform-browser-dynamic": "^4.0.0",
    "@angular/router": "^4.0.0",
    "angularfire2": "^5.0.0-rc.3",
    "core-js": "^2.4.1",
    "firebase": "^4.7.0",
    "rxjs": "^5.0.1",
    "xjs": "^0.1.6",
    "zone.js": "^0.8.4"
  },
  "devDependencies": {
    "@angular/cli": "1.1.0",
    "@angular/compiler-cli": "^4.0.0",
    "@angular/language-service": "^4.0.0",
    "@types/jasmine": "2.5.45",
    "@types/node": "~6.0.60",
    "angular2": "^2.0.0-beta.21",
    "codelyzer": "~3.0.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.0.4",
    "tslint": "~5.3.2",
    "typescript": "~2.3.3"
  }
}

我使用angular和nodejs版本 @angular/cli:1.1.0 节点：8.11.2

---

os:darwin x64

我认为问题与您正在使用一种不推荐的访问列表数据的方法有关。请参阅有关访问列表的信息

它提供了不使用

FirebaseListObservable

的示例：

import { Component } from '@angular/core';
import { AngularFireDatabase } from 'angularfire2/database';
import { Observable } from 'rxjs';

@Component({
  selector: 'app-root',
  template: `
  <ul>
    <li *ngFor="let item of items | async">
       {{ item | json }}
    </li>
  </ul>
  `,
})
export class AppComponent {
  items: Observable<any[]>;

  constructor(db: AngularFireDatabase) {
    this.items = db.list('items').valueChanges();
  }

}

从'@angular/core'导入{Component}；
从“angularfire2/database”导入{AngularFireDatabase}；
从“rxjs”导入{Observable}；
@组成部分({
选择器：'应用程序根'，
模板：`


{{item | json}}


`,
})
导出类AppComponent{
项目：可观察；
构造函数（db:AngularFireDatabase）{
this.items=db.list（'items'）.valueChanges（）；
}
}

我使用angular2版本：1.1.0节点：8.11.2 os:darwin x64这里的重要包是Angularfire2包。。。不是您的Angular CLI版本，不是您的节点版本，当然也不是您的操作系统。在你的TypeScript和HTML文件中调整你的代码，这样它就不会使用Angularfire2中不推荐的部分，你就不会再收到这个错误了。谢谢你的回答，我感谢你的努力，我想看看这个问题，它也与observable相关

{
  "name": "newap",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.0.0",
    "@angular/common": "^4.0.0",
    "@angular/compiler": "^4.0.0",
    "@angular/core": "^4.0.0",
    "@angular/forms": "^4.0.0",
    "@angular/http": "^4.0.0",
    "@angular/platform-browser": "^4.0.0",
    "@angular/platform-browser-dynamic": "^4.0.0",
    "@angular/router": "^4.0.0",
    "angularfire2": "^5.0.0-rc.3",
    "core-js": "^2.4.1",
    "firebase": "^4.7.0",
    "rxjs": "^5.0.1",
    "xjs": "^0.1.6",
    "zone.js": "^0.8.4"
  },
  "devDependencies": {
    "@angular/cli": "1.1.0",
    "@angular/compiler-cli": "^4.0.0",
    "@angular/language-service": "^4.0.0",
    "@types/jasmine": "2.5.45",
    "@types/node": "~6.0.60",
    "angular2": "^2.0.0-beta.21",
    "codelyzer": "~3.0.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.0.4",
    "tslint": "~5.3.2",
    "typescript": "~2.3.3"
  }
}

import { Component } from '@angular/core';
import { AngularFireDatabase } from 'angularfire2/database';
import { Observable } from 'rxjs';

@Component({
  selector: 'app-root',
  template: `
  <ul>
    <li *ngFor="let item of items | async">
       {{ item | json }}
    </li>
  </ul>
  `,
})
export class AppComponent {
  items: Observable<any[]>;

  constructor(db: AngularFireDatabase) {
    this.items = db.list('items').valueChanges();
  }

}