Javascript 如何从angular2 firebase数据中获取数据。？

我在angular2 firebase中有一个列表，但我没有从中获得值

我的ts文件是这个

import { Component, OnInit,Input } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable, FirebaseObjectObservable } from 'angularfire2/database';
import * as firebase from 'firebase';
import { FirebseService } from "app/firebse.service";

@Component({
  selector: 'app-candidate-reg-complete',
  templateUrl: './candidate-reg-complete.component.html',
  styleUrls: ['./candidate-reg-complete.component.css']
})
export class CandidateRegCompleteComponent implements OnInit {
  content:any;
item: FirebaseObjectObservable<any>;
  constructor(private db: AngularFireDatabase,
  private firebaseService:FirebseService) { 
    this.item = db.object('candidates_list');
  }

  ngOnInit() {
  }
  upload(documents){

  //  let file=user.files[0];
  //   console.log(file);
  //  console.log(file.name);
  let storageRef=firebase.storage().ref();

    for(let selectedFile of[(<HTMLInputElement>document.getElementById('file')).files[0]]){

     let path='/resumes/'+selectedFile.name;
      let iRef=storageRef.child(path);
      iRef.put(selectedFile).then((snapshot)=>{
        debugger;
       documents.resume=selectedFile.name;
       documents.path=path;

        var Userid=localStorage.getItem('user');
        console.log(documents);
        let content=this.db.object('/candidates_list/'+Userid);
        console.log(content);

        // this.db.object('/candidates_list/'+Userid).update(documents);
      localStorage.setItem('resume',documents.path);

      })
 }

}
}

当我试图控制这个值时，输出如下

FirebaseObjectObservable {_isScalar: false, $ref: U, source: FirebaseObjectObservable, operator: ObserveOnOperator}

---

没有精确的内容，所以这个问题有什么解决方案吗？

您需要订阅observable。试试这个：

 let content = this.db.object('/candidates_list/'+Userid)
  content.subscribe(data => {
    console.log(data)})

---

很高兴听到。如果高兴，请标记为已解决。干杯

 let content = this.db.object('/candidates_list/'+Userid)
  content.subscribe(data => {
    console.log(data)})