[英]Get data from Object with Node.js
我無法從“快照”對象訪問數據,但我不知道為什么:
[
{"action":"Afficher les détails ","cat":"Produits 1","image":"https://www.google.fr","lien":"https://www.google.fr","nom_intent":"1","reponse":"réponse 1","scat":"scat1"},
{"action":"Afficher les détails ","cat":"Produits 2","image":"https://www.google.fr","lien":"https://www.google.fr","nom_intent":"2","reponse":"réponse 2","scat":"scat2"},
{"action":"Afficher les détails ","cat":"Produits 3","image":"https://www.google.fr","lien":"https://www.google.fr","nom_intent":"3","reponse":"réponse 3","scat":"scat3"}
]
我用下面的代碼得到這個對象:
function getFirebaseData(endpoint){
return
firebase.database().ref('intent/'+endpoint).once("value",
function(snapshot){
return snapshot.val();
});
}
Promise.all([
getFirebaseData(entities.intent[0].value),
getFirebaseData(entities.intent[1].value),
getFirebaseData(entities.intent[2].value)
]).then(function(snapshots) {
});
並嘗試這樣訪問:
var action0 = snapshots[0].action;
但是action0
是undefined
我找到了把這件事做好的把戲!
我研究了一個數組: var firebaseData = [];
firebaseData var firebaseData = [];
然后我把所有的價值觀都推了進去:
function getFirebaseData(endpoint){
return firebase.database().ref('intent/'+endpoint).once("value", function(snapshot){
firebaseData.push(snapshot.val());
});
}
當承諾完成后,我將這樣訪問:
Promise.all([
getFirebaseData(entities.intent[0].value),
getFirebaseData(entities.intent[1].value),
getFirebaseData(entities.intent[2].value)])
.then(function(snapshots) {
var zero = firebaseData[0];
var first = firebaseData[1];
});
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