离子框架将数据附加到数组

Question

firedata = firebase.database().ref('/chatusers/');    
postData(val){    
items=[];
this.items.push(val);
      this.firedata.child(this.afireauth.auth.currentUser.uid).update({
        uid: this.afireauth.auth.currentUser.uid,
        post: this.items,
        displayName: this.afireauth.auth.currentUser.displayName
      })
 })

我正在尝试将我的数据推送到 Firebase，所以每次调用 postData 函数时，我都希望我的数组 items=[] 继续附加数据 val。 目前它只是用新值覆盖。 我是ionic3 的新手，所以请帮助我。

expected output:
---post
      0: 'A'
      1: 'B'
      2: 'C'
uid:
-----------------------------------------------

Code with ionic3 storage


    firedata = firebase.database().ref('/chatusers/');    
        postData(val){
    var uniqueUID = this.afireauth.auth.currentUser.uid;

    let toaster = this.toastCtrl.create({
      duration: 3000,
      position: 'bottom'
    });

    if(this.userdata.title==""){
      toaster.setMessage("Please fill out the title");
      toaster.present();
    }

    this.storage.get('Task1-'+uniqueUID).then((item)=> {
      if (item != null) {
        item.push(val);
        this.storage.set('Task1-'+uniqueUID, item);
      }
      else {
        let array = [];
        array.push(val);
        this.storage.set('Task1-'+uniqueUID, array);
      }
      this.items.push(val);
      this.firedata.child(this.afireauth.auth.currentUser.uid).update({
        uid: this.afireauth.auth.currentUser.uid,
        post: item,
        displayName: this.afireauth.auth.currentUser.displayName
      })

    })

  }
}

Answer 1

如下图在myMethod()外声明即可。

items:any=[];

constructor(){

}

myMethod(){

    firedata = firebase.database().ref('/chatusers/');    
    postData(val){    

    this.items.push(val);
      this.firedata.child(this.afireauth.auth.currentUser.uid).update({
        uid: this.afireauth.auth.currentUser.uid,
        post: this.items,
        displayName: this.afireauth.auth.currentUser.displayName
      })
 })
}